diff --git a/apps/app_seeds/assets/fonts/NotoSansArabic-OFL.txt b/apps/app_seeds/assets/fonts/NotoSansArabic-OFL.txt
new file mode 100644
index 0000000..14c589f
--- /dev/null
+++ b/apps/app_seeds/assets/fonts/NotoSansArabic-OFL.txt
@@ -0,0 +1,93 @@
+Copyright 2022 The Noto Project Authors (https://github.com/notofonts/arabic)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.
diff --git a/apps/app_seeds/assets/fonts/NotoSansArabic.ttf b/apps/app_seeds/assets/fonts/NotoSansArabic.ttf
new file mode 100644
index 0000000..f1d01ed
Binary files /dev/null and b/apps/app_seeds/assets/fonts/NotoSansArabic.ttf differ
diff --git a/apps/app_seeds/assets/fonts/NotoSansJP-OFL.txt b/apps/app_seeds/assets/fonts/NotoSansJP-OFL.txt
new file mode 100644
index 0000000..1c9f432
--- /dev/null
+++ b/apps/app_seeds/assets/fonts/NotoSansJP-OFL.txt
@@ -0,0 +1,93 @@
+Copyright 2014-2021 Adobe (http://www.adobe.com/), with Reserved Font Name 'Source'
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.
diff --git a/apps/app_seeds/assets/fonts/NotoSansJP.ttf b/apps/app_seeds/assets/fonts/NotoSansJP.ttf
new file mode 100644
index 0000000..cdd8f08
Binary files /dev/null and b/apps/app_seeds/assets/fonts/NotoSansJP.ttf differ
diff --git a/apps/app_seeds/lib/i18n/ast.i18n.json b/apps/app_seeds/lib/i18n/ast.i18n.json
index 4f4b26b..87aa385 100644
--- a/apps/app_seeds/lib/i18n/ast.i18n.json
+++ b/apps/app_seeds/lib/i18n/ast.i18n.json
@@ -97,6 +97,7 @@
     "langAst": "Asturianu",
     "langFr": "Français",
     "langDe": "Deutsch",
+    "langJa": "日本語",
     "about": "Tocante a",
     "aboutText": "Inventariu llocal y cifráu pa simiente tradicional. AGPL-3.0.",
     "aboutOpen": "Tocante a Tane"
diff --git a/apps/app_seeds/lib/i18n/de.i18n.json b/apps/app_seeds/lib/i18n/de.i18n.json
index 2bac6b1..a65e1a6 100644
--- a/apps/app_seeds/lib/i18n/de.i18n.json
+++ b/apps/app_seeds/lib/i18n/de.i18n.json
@@ -100,7 +100,8 @@
     "aboutText": "Lokale, verschlüsselte Saatgutbank für traditionelle Samen. AGPL-3.0.",
     "aboutOpen": "Über Tane",
     "langDe": "Deutsch",
-    "langFr": "Français"
+    "langFr": "Français",
+    "langJa": "日本語"
   },
   "backup": {
     "title": "Sicherung und Wiederherstellung",
diff --git a/apps/app_seeds/lib/i18n/en.i18n.json b/apps/app_seeds/lib/i18n/en.i18n.json
index ea1bd75..9cce88b 100644
--- a/apps/app_seeds/lib/i18n/en.i18n.json
+++ b/apps/app_seeds/lib/i18n/en.i18n.json
@@ -98,6 +98,7 @@
     "langAst": "Asturianu",
     "langFr": "Français",
     "langDe": "Deutsch",
+    "langJa": "日本語",
     "about": "About",
     "aboutText": "Local-first, encrypted inventory for traditional seeds. AGPL-3.0.",
     "aboutOpen": "About Tane"
diff --git a/apps/app_seeds/lib/i18n/es.i18n.json b/apps/app_seeds/lib/i18n/es.i18n.json
index 9b38efd..36b885d 100644
--- a/apps/app_seeds/lib/i18n/es.i18n.json
+++ b/apps/app_seeds/lib/i18n/es.i18n.json
@@ -97,6 +97,7 @@
     "langPt": "Português",
     "langFr": "Français",
     "langDe": "Deutsch",
+    "langJa": "日本語",
     "about": "Acerca de",
     "aboutText": "Inventario local y cifrado para semillas tradicionales. AGPL-3.0.",
     "aboutOpen": "Acerca de Tane"
diff --git a/apps/app_seeds/lib/i18n/fr.i18n.json b/apps/app_seeds/lib/i18n/fr.i18n.json
index 8984454..7855a9d 100644
--- a/apps/app_seeds/lib/i18n/fr.i18n.json
+++ b/apps/app_seeds/lib/i18n/fr.i18n.json
@@ -98,6 +98,7 @@
     "langAst": "Asturianu",
     "langFr": "Français",
     "langDe": "Deutsch",
+    "langJa": "日本語",
     "about": "À propos",
     "aboutText": "Inventaire local-first et chiffré pour les semences traditionnelles. AGPL-3.0.",
     "aboutOpen": "À propos de Tane"
diff --git a/apps/app_seeds/lib/i18n/ja.i18n.json b/apps/app_seeds/lib/i18n/ja.i18n.json
new file mode 100644
index 0000000..b84bc5f
--- /dev/null
+++ b/apps/app_seeds/lib/i18n/ja.i18n.json
@@ -0,0 +1,46 @@
+{
+    "app": {
+        "title": "Tane"
+    },
+    "common": {
+        "save": "保存",
+        "cancel": "キャンセル",
+        "delete": "削除",
+        "edit": "編集",
+        "type": "種類",
+        "comingSoon": "近日公開",
+        "offline": "オフラインです — 共有を一時停止しています"
+    },
+    "menu": {
+        "tagline": "あなたの種子バンク",
+        "inventory": "在庫",
+        "market": "マーケット",
+        "profile": "プロフィール",
+        "chat": "チャット",
+        "wishlist": "お気に入り",
+        "following": "フォロー中",
+        "calendar": "カレンダー",
+        "settings": "設定"
+    },
+    "settings": {
+        "language": "言語",
+        "systemLanguage": "システムの言語",
+        "langEs": "Español",
+        "langEn": "English",
+        "langPt": "Português",
+        "langAst": "Asturianu",
+        "langFr": "Français",
+        "langDe": "Deutsch",
+        "langJa": "日本語",
+        "about": "このアプリについて",
+        "aboutText": "在来種のためのローカルファースト・暗号化在庫管理。AGPL-3.0。",
+        "aboutOpen": "Tane について"
+    },
+    "home": {
+        "tagline": "地域の種を分かち合い、育てよう",
+        "openMarket": "マーケット",
+        "openMarketSubtitle": "近くの種を見つけて分かち合う",
+        "yourInventory": "あなたの在庫",
+        "yourInventorySubtitle": "種を管理する"
+    }
+}
diff --git a/apps/app_seeds/lib/i18n/pt.i18n.json b/apps/app_seeds/lib/i18n/pt.i18n.json
index a6e40e4..07ebc8b 100644
--- a/apps/app_seeds/lib/i18n/pt.i18n.json
+++ b/apps/app_seeds/lib/i18n/pt.i18n.json
@@ -98,6 +98,7 @@
     "langAst": "Asturianu",
     "langFr": "Français",
     "langDe": "Deutsch",
+    "langJa": "日本語",
     "about": "Acerca de",
     "aboutText": "Inventário local e cifrado para sementes tradicionais. AGPL-3.0.",
     "aboutOpen": "Acerca do Tane"
diff --git a/apps/app_seeds/lib/i18n/strings.g.dart b/apps/app_seeds/lib/i18n/strings.g.dart
index 3a7f6f4..89ac0b4 100644
--- a/apps/app_seeds/lib/i18n/strings.g.dart
+++ b/apps/app_seeds/lib/i18n/strings.g.dart
@@ -3,10 +3,10 @@
 /// Source: lib/i18n
 /// To regenerate, run: `dart run slang`
 ///
-/// Locales: 6
-/// Strings: 3356 (559 per locale)
+/// Locales: 7
+/// Strings: 3396 (485 per locale)
 ///
-/// Built on 2026-07-13 at 16:11 UTC
+/// Built on 2026-07-14 at 09:00 UTC
 
 // coverage:ignore-file
 // ignore_for_file: type=lint, unused_import
@@ -22,6 +22,7 @@ import 'strings_ast.g.dart' as l_ast;
 import 'strings_de.g.dart' as l_de;
 import 'strings_es.g.dart' as l_es;
 import 'strings_fr.g.dart' as l_fr;
+import 'strings_ja.g.dart' as l_ja;
 import 'strings_pt.g.dart' as l_pt;
 part 'strings_en.g.dart';
 
@@ -37,6 +38,7 @@ enum AppLocale with BaseAppLocale<AppLocale, Translations> {
 	de(languageCode: 'de'),
 	es(languageCode: 'es'),
 	fr(languageCode: 'fr'),
+	ja(languageCode: 'ja'),
 	pt(languageCode: 'pt');
 
 	const AppLocale({
@@ -99,6 +101,12 @@ enum AppLocale with BaseAppLocale<AppLocale, Translations> {
 					cardinalResolver: cardinalResolver,
 					ordinalResolver: ordinalResolver,
 				);
+			case AppLocale.ja:
+				return l_ja.TranslationsJa(
+					overrides: overrides,
+					cardinalResolver: cardinalResolver,
+					ordinalResolver: ordinalResolver,
+				);
 			case AppLocale.pt:
 				return l_pt.TranslationsPt(
 					overrides: overrides,
diff --git a/apps/app_seeds/lib/i18n/strings_ast.g.dart b/apps/app_seeds/lib/i18n/strings_ast.g.dart
index 41acb84..2167666 100644
--- a/apps/app_seeds/lib/i18n/strings_ast.g.dart
+++ b/apps/app_seeds/lib/i18n/strings_ast.g.dart
@@ -265,6 +265,7 @@ class _Translations$settings$ast extends Translations$settings$en {
 	@override String get langAst => 'Asturianu';
 	@override String get langFr => 'Français';
 	@override String get langDe => 'Deutsch';
+	@override String get langJa => '日本語';
 	@override String get about => 'Tocante a';
 	@override String get aboutText => 'Inventariu llocal y cifráu pa simiente tradicional. AGPL-3.0.';
 	@override String get aboutOpen => 'Tocante a Tane';
@@ -1488,6 +1489,7 @@ extension on TranslationsAst {
 			'settings.langAst' => 'Asturianu',
 			'settings.langFr' => 'Français',
 			'settings.langDe' => 'Deutsch',
+			'settings.langJa' => '日本語',
 			'settings.about' => 'Tocante a',
 			'settings.aboutText' => 'Inventariu llocal y cifráu pa simiente tradicional. AGPL-3.0.',
 			'settings.aboutOpen' => 'Tocante a Tane',
@@ -1922,9 +1924,9 @@ extension on TranslationsAst {
 			'sale.iSold' => 'Vendí',
 			'sale.iBought' => 'Mercué',
 			'sale.direction' => '¿Vendes o merques?',
-			'sale.counterparty' => '¿Con quién?',
 			_ => null,
 		} ?? switch (path) {
+			'sale.counterparty' => '¿Con quién?',
 			'sale.counterpartyHint' => 'Una persona o un coleutivu (opcional)',
 			'sale.amount' => 'Importe',
 			'sale.currency' => 'Moneda',
diff --git a/apps/app_seeds/lib/i18n/strings_de.g.dart b/apps/app_seeds/lib/i18n/strings_de.g.dart
index d8f82b0..b959d59 100644
--- a/apps/app_seeds/lib/i18n/strings_de.g.dart
+++ b/apps/app_seeds/lib/i18n/strings_de.g.dart
@@ -269,6 +269,7 @@ class _Translations$settings$de extends Translations$settings$en {
 	@override String get aboutOpen => 'Über Tane';
 	@override String get langDe => 'Deutsch';
 	@override String get langFr => 'Français';
+	@override String get langJa => '日本語';
 }
 
 // Path: backup
@@ -1488,6 +1489,7 @@ extension on TranslationsDe {
 			'settings.aboutOpen' => 'Über Tane',
 			'settings.langDe' => 'Deutsch',
 			'settings.langFr' => 'Français',
+			'settings.langJa' => '日本語',
 			'backup.title' => 'Sicherung und Wiederherstellung',
 			'backup.autoBackupTitle' => 'Automatische Sicherungen',
 			'backup.autoBackupLast' => ({required Object date}) => 'Letzte Sicherung ${date}',
@@ -1918,9 +1920,9 @@ extension on TranslationsDe {
 			'sale.counterpartyHint' => 'Eine Person oder ein Kollektiv (optional)',
 			'sale.amount' => 'Betrag',
 			'sale.currency' => 'Währung',
-			'sale.currencyHint' => '€, Ğ1, Stunden… (optional)',
 			_ => null,
 		} ?? switch (path) {
+			'sale.currencyHint' => '€, Ğ1, Stunden… (optional)',
 			'sale.hours' => 'Stunden',
 			'sale.note' => 'Notiz (optional)',
 			'sale.save' => 'Speichern',
diff --git a/apps/app_seeds/lib/i18n/strings_en.g.dart b/apps/app_seeds/lib/i18n/strings_en.g.dart
index f978628..7cf9808 100644
--- a/apps/app_seeds/lib/i18n/strings_en.g.dart
+++ b/apps/app_seeds/lib/i18n/strings_en.g.dart
@@ -424,6 +424,9 @@ class Translations$settings$en {
 	/// en: 'Deutsch'
 	String get langDe => 'Deutsch';
 
+	/// en: '日本語'
+	String get langJa => '日本語';
+
 	/// en: 'About'
 	String get about => 'About';
 
@@ -2598,6 +2601,7 @@ extension on Translations {
 			'settings.langAst' => 'Asturianu',
 			'settings.langFr' => 'Français',
 			'settings.langDe' => 'Deutsch',
+			'settings.langJa' => '日本語',
 			'settings.about' => 'About',
 			'settings.aboutText' => 'Local-first, encrypted inventory for traditional seeds. AGPL-3.0.',
 			'settings.aboutOpen' => 'About Tane',
@@ -3031,9 +3035,9 @@ extension on Translations {
 			'sale.help' => 'Record seed you sold or bought — money, Ğ1, or any currency. A separate model from a gift or a Plantare. No commission is ever taken on seeds.',
 			'sale.add' => 'Record a sale',
 			'sale.empty' => 'No sales yet. Note here what you sell or buy.',
-			'sale.iSold' => 'I sold',
 			_ => null,
 		} ?? switch (path) {
+			'sale.iSold' => 'I sold',
 			'sale.iBought' => 'I bought',
 			'sale.direction' => 'Sold or bought?',
 			'sale.counterparty' => 'With whom?',
diff --git a/apps/app_seeds/lib/i18n/strings_es.g.dart b/apps/app_seeds/lib/i18n/strings_es.g.dart
index e94c59d..9722a74 100644
--- a/apps/app_seeds/lib/i18n/strings_es.g.dart
+++ b/apps/app_seeds/lib/i18n/strings_es.g.dart
@@ -265,6 +265,7 @@ class _Translations$settings$es extends Translations$settings$en {
 	@override String get langPt => 'Português';
 	@override String get langFr => 'Français';
 	@override String get langDe => 'Deutsch';
+	@override String get langJa => '日本語';
 	@override String get about => 'Acerca de';
 	@override String get aboutText => 'Inventario local y cifrado para semillas tradicionales. AGPL-3.0.';
 	@override String get aboutOpen => 'Acerca de Tane';
@@ -1490,6 +1491,7 @@ extension on TranslationsEs {
 			'settings.langPt' => 'Português',
 			'settings.langFr' => 'Français',
 			'settings.langDe' => 'Deutsch',
+			'settings.langJa' => '日本語',
 			'settings.about' => 'Acerca de',
 			'settings.aboutText' => 'Inventario local y cifrado para semillas tradicionales. AGPL-3.0.',
 			'settings.aboutOpen' => 'Acerca de Tane',
@@ -1924,9 +1926,9 @@ extension on TranslationsEs {
 			'sale.add' => 'Registrar venta',
 			'sale.empty' => 'Aún no hay ventas. Anota aquí lo que vendes o compras.',
 			'sale.iSold' => 'Vendí',
-			'sale.iBought' => 'Compré',
 			_ => null,
 		} ?? switch (path) {
+			'sale.iBought' => 'Compré',
 			'sale.direction' => '¿Vendes o compras?',
 			'sale.counterparty' => '¿Con quién?',
 			'sale.counterpartyHint' => 'Una persona o un colectivo (opcional)',
diff --git a/apps/app_seeds/lib/i18n/strings_fr.g.dart b/apps/app_seeds/lib/i18n/strings_fr.g.dart
index f4273dc..9cc3259 100644
--- a/apps/app_seeds/lib/i18n/strings_fr.g.dart
+++ b/apps/app_seeds/lib/i18n/strings_fr.g.dart
@@ -266,6 +266,7 @@ class _Translations$settings$fr extends Translations$settings$en {
 	@override String get langAst => 'Asturianu';
 	@override String get langFr => 'Français';
 	@override String get langDe => 'Deutsch';
+	@override String get langJa => '日本語';
 	@override String get about => 'À propos';
 	@override String get aboutText => 'Inventaire local-first et chiffré pour les semences traditionnelles. AGPL-3.0.';
 	@override String get aboutOpen => 'À propos de Tane';
@@ -1485,6 +1486,7 @@ extension on TranslationsFr {
 			'settings.langAst' => 'Asturianu',
 			'settings.langFr' => 'Français',
 			'settings.langDe' => 'Deutsch',
+			'settings.langJa' => '日本語',
 			'settings.about' => 'À propos',
 			'settings.aboutText' => 'Inventaire local-first et chiffré pour les semences traditionnelles. AGPL-3.0.',
 			'settings.aboutOpen' => 'À propos de Tane',
@@ -1918,9 +1920,9 @@ extension on TranslationsFr {
 			'sale.counterpartyHint' => 'Une personne ou un collectif (optionnel)',
 			'sale.amount' => 'Montant',
 			'sale.currency' => 'Monnaie',
-			'sale.currencyHint' => '€, Ğ1, heures… (optionnel)',
 			_ => null,
 		} ?? switch (path) {
+			'sale.currencyHint' => '€, Ğ1, heures… (optionnel)',
 			'sale.hours' => 'heures',
 			'sale.note' => 'Note (optionnel)',
 			'sale.save' => 'Enregistrer',
diff --git a/apps/app_seeds/lib/i18n/strings_ja.g.dart b/apps/app_seeds/lib/i18n/strings_ja.g.dart
new file mode 100644
index 0000000..01cfd2e
--- /dev/null
+++ b/apps/app_seeds/lib/i18n/strings_ja.g.dart
@@ -0,0 +1,173 @@
+///
+/// Generated file. Do not edit.
+///
+// coverage:ignore-file
+// ignore_for_file: type=lint, unused_import
+// dart format off
+
+import 'package:flutter/widgets.dart';
+import 'package:intl/intl.dart';
+import 'package:slang/generated.dart';
+import 'strings.g.dart';
+
+// Path: <root>
+class TranslationsJa extends Translations with BaseTranslations<AppLocale, Translations> {
+	/// You can call this constructor and build your own translation instance of this locale.
+	/// Constructing via the enum [AppLocale.build] is preferred.
+	TranslationsJa({Map<String, Node>? overrides, PluralResolver? cardinalResolver, PluralResolver? ordinalResolver, TranslationMetadata<AppLocale, Translations>? meta})
+		: assert(overrides == null, 'Set "translation_overrides: true" in order to enable this feature.'),
+		  $meta = meta ?? TranslationMetadata(
+		    locale: AppLocale.ja,
+		    overrides: overrides ?? {},
+		    cardinalResolver: cardinalResolver,
+		    ordinalResolver: ordinalResolver,
+		  ),
+		  super(cardinalResolver: cardinalResolver, ordinalResolver: ordinalResolver) {
+		super.$meta.setFlatMapFunction($meta.getTranslation); // copy base translations to super.$meta
+		$meta.setFlatMapFunction(_flatMapFunction);
+	}
+
+	/// Metadata for the translations of <ja>.
+	@override final TranslationMetadata<AppLocale, Translations> $meta;
+
+	/// Access flat map
+	@override dynamic operator[](String key) => $meta.getTranslation(key) ?? super.$meta.getTranslation(key);
+
+	late final TranslationsJa _root = this; // ignore: unused_field
+
+	@override 
+	TranslationsJa $copyWith({TranslationMetadata<AppLocale, Translations>? meta}) => TranslationsJa(meta: meta ?? this.$meta);
+
+	// Translations
+	@override late final _Translations$app$ja app = _Translations$app$ja._(_root);
+	@override late final _Translations$common$ja common = _Translations$common$ja._(_root);
+	@override late final _Translations$menu$ja menu = _Translations$menu$ja._(_root);
+	@override late final _Translations$settings$ja settings = _Translations$settings$ja._(_root);
+	@override late final _Translations$home$ja home = _Translations$home$ja._(_root);
+}
+
+// Path: app
+class _Translations$app$ja extends Translations$app$en {
+	_Translations$app$ja._(TranslationsJa root) : this._root = root, super.internal(root);
+
+	final TranslationsJa _root; // ignore: unused_field
+
+	// Translations
+	@override String get title => 'Tane';
+}
+
+// Path: common
+class _Translations$common$ja extends Translations$common$en {
+	_Translations$common$ja._(TranslationsJa root) : this._root = root, super.internal(root);
+
+	final TranslationsJa _root; // ignore: unused_field
+
+	// Translations
+	@override String get save => '保存';
+	@override String get cancel => 'キャンセル';
+	@override String get delete => '削除';
+	@override String get edit => '編集';
+	@override String get type => '種類';
+	@override String get comingSoon => '近日公開';
+	@override String get offline => 'オフラインです — 共有を一時停止しています';
+}
+
+// Path: menu
+class _Translations$menu$ja extends Translations$menu$en {
+	_Translations$menu$ja._(TranslationsJa root) : this._root = root, super.internal(root);
+
+	final TranslationsJa _root; // ignore: unused_field
+
+	// Translations
+	@override String get tagline => 'あなたの種子バンク';
+	@override String get inventory => '在庫';
+	@override String get market => 'マーケット';
+	@override String get profile => 'プロフィール';
+	@override String get chat => 'チャット';
+	@override String get wishlist => 'お気に入り';
+	@override String get following => 'フォロー中';
+	@override String get calendar => 'カレンダー';
+	@override String get settings => '設定';
+}
+
+// Path: settings
+class _Translations$settings$ja extends Translations$settings$en {
+	_Translations$settings$ja._(TranslationsJa root) : this._root = root, super.internal(root);
+
+	final TranslationsJa _root; // ignore: unused_field
+
+	// Translations
+	@override String get language => '言語';
+	@override String get systemLanguage => 'システムの言語';
+	@override String get langEs => 'Español';
+	@override String get langEn => 'English';
+	@override String get langPt => 'Português';
+	@override String get langAst => 'Asturianu';
+	@override String get langFr => 'Français';
+	@override String get langDe => 'Deutsch';
+	@override String get langJa => '日本語';
+	@override String get about => 'このアプリについて';
+	@override String get aboutText => '在来種のためのローカルファースト・暗号化在庫管理。AGPL-3.0。';
+	@override String get aboutOpen => 'Tane について';
+}
+
+// Path: home
+class _Translations$home$ja extends Translations$home$en {
+	_Translations$home$ja._(TranslationsJa root) : this._root = root, super.internal(root);
+
+	final TranslationsJa _root; // ignore: unused_field
+
+	// Translations
+	@override String get tagline => '地域の種を分かち合い、育てよう';
+	@override String get openMarket => 'マーケット';
+	@override String get openMarketSubtitle => '近くの種を見つけて分かち合う';
+	@override String get yourInventory => 'あなたの在庫';
+	@override String get yourInventorySubtitle => '種を管理する';
+}
+
+/// The flat map containing all translations for locale <ja>.
+/// Only for edge cases! For simple maps, use the map function of this library.
+///
+/// The Dart AOT compiler has issues with very large switch statements,
+/// so the map is split into smaller functions (512 entries each).
+extension on TranslationsJa {
+	dynamic _flatMapFunction(String path) {
+		return switch (path) {
+			'app.title' => 'Tane',
+			'common.save' => '保存',
+			'common.cancel' => 'キャンセル',
+			'common.delete' => '削除',
+			'common.edit' => '編集',
+			'common.type' => '種類',
+			'common.comingSoon' => '近日公開',
+			'common.offline' => 'オフラインです — 共有を一時停止しています',
+			'menu.tagline' => 'あなたの種子バンク',
+			'menu.inventory' => '在庫',
+			'menu.market' => 'マーケット',
+			'menu.profile' => 'プロフィール',
+			'menu.chat' => 'チャット',
+			'menu.wishlist' => 'お気に入り',
+			'menu.following' => 'フォロー中',
+			'menu.calendar' => 'カレンダー',
+			'menu.settings' => '設定',
+			'settings.language' => '言語',
+			'settings.systemLanguage' => 'システムの言語',
+			'settings.langEs' => 'Español',
+			'settings.langEn' => 'English',
+			'settings.langPt' => 'Português',
+			'settings.langAst' => 'Asturianu',
+			'settings.langFr' => 'Français',
+			'settings.langDe' => 'Deutsch',
+			'settings.langJa' => '日本語',
+			'settings.about' => 'このアプリについて',
+			'settings.aboutText' => '在来種のためのローカルファースト・暗号化在庫管理。AGPL-3.0。',
+			'settings.aboutOpen' => 'Tane について',
+			'home.tagline' => '地域の種を分かち合い、育てよう',
+			'home.openMarket' => 'マーケット',
+			'home.openMarketSubtitle' => '近くの種を見つけて分かち合う',
+			'home.yourInventory' => 'あなたの在庫',
+			'home.yourInventorySubtitle' => '種を管理する',
+			_ => null,
+		};
+	}
+}
diff --git a/apps/app_seeds/lib/i18n/strings_pt.g.dart b/apps/app_seeds/lib/i18n/strings_pt.g.dart
index 7ff9a19..b65a307 100644
--- a/apps/app_seeds/lib/i18n/strings_pt.g.dart
+++ b/apps/app_seeds/lib/i18n/strings_pt.g.dart
@@ -266,6 +266,7 @@ class _Translations$settings$pt extends Translations$settings$en {
 	@override String get langAst => 'Asturianu';
 	@override String get langFr => 'Français';
 	@override String get langDe => 'Deutsch';
+	@override String get langJa => '日本語';
 	@override String get about => 'Acerca de';
 	@override String get aboutText => 'Inventário local e cifrado para sementes tradicionais. AGPL-3.0.';
 	@override String get aboutOpen => 'Acerca do Tane';
@@ -1488,6 +1489,7 @@ extension on TranslationsPt {
 			'settings.langAst' => 'Asturianu',
 			'settings.langFr' => 'Français',
 			'settings.langDe' => 'Deutsch',
+			'settings.langJa' => '日本語',
 			'settings.about' => 'Acerca de',
 			'settings.aboutText' => 'Inventário local e cifrado para sementes tradicionais. AGPL-3.0.',
 			'settings.aboutOpen' => 'Acerca do Tane',
@@ -1921,9 +1923,9 @@ extension on TranslationsPt {
 			'sale.iBought' => 'Comprei',
 			'sale.direction' => 'Vendes ou compras?',
 			'sale.counterparty' => 'Com quem?',
-			'sale.counterpartyHint' => 'Uma pessoa ou um coletivo (opcional)',
 			_ => null,
 		} ?? switch (path) {
+			'sale.counterpartyHint' => 'Uma pessoa ou um coletivo (opcional)',
 			'sale.amount' => 'Montante',
 			'sale.currency' => 'Moeda',
 			'sale.currencyHint' => '€, Ğ1, horas… (opcional)',
diff --git a/apps/app_seeds/lib/services/label_sheet_service.dart b/apps/app_seeds/lib/services/label_sheet_service.dart
index d0383d1..d109f08 100644
--- a/apps/app_seeds/lib/services/label_sheet_service.dart
+++ b/apps/app_seeds/lib/services/label_sheet_service.dart
@@ -1,11 +1,11 @@
 import 'dart:math' as math;
 import 'dart:typed_data';
 
-import 'package:flutter/services.dart' show rootBundle;
 import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart' as pw;
 
 import 'file_service.dart';
+import 'pdf_fonts.dart';
 
 /// How the labels are tiled on the page: many small stickers to peel onto
 /// packets, or fewer larger cards for jars and boxes.
@@ -65,9 +65,10 @@ class _Geometry {
 /// platform channels apart from loading the bundled font, so it runs (and is
 /// tested) on the host.
 ///
-/// The embedded DejaVu face covers Latin (extended), Cyrillic and Greek. Like
-/// the OCR traineddata, the PDF font is a per-locale resource: wider scripts
-/// (Arabic, CJK) ship alongside their locales, not hardcoded here.
+/// The embedded DejaVu face covers Latin (extended), Cyrillic and Greek, with
+/// Noto Arabic + Noto CJK as per-glyph fallbacks (see [buildPdfTheme]) so RTL
+/// and CJK text render. Fonts are a per-locale resource, extensible to any
+/// script.
 class LabelSheetService {
   LabelSheetService({required FileService files}) : _files = files;
 
@@ -103,15 +104,8 @@ class LabelSheetService {
     bool rtl = false,
   }) async {
     final textDirection = rtl ? pw.TextDirection.rtl : pw.TextDirection.ltr;
-    final base = pw.Font.ttf(
-      await rootBundle.load('assets/fonts/DejaVuSans.ttf'),
-    );
-    final bold = pw.Font.ttf(
-      await rootBundle.load('assets/fonts/DejaVuSans-Bold.ttf'),
-    );
-    final doc = pw.Document(
-      theme: pw.ThemeData.withFont(base: base, bold: bold, italic: base),
-    );
+    final fonts = await loadPdfFonts();
+    final doc = pw.Document(theme: fonts.theme);
 
     final g = _geometryOf(format);
     final labelWidth = (PdfPageFormat.a4.width - _margin * 2) / g.columns;
@@ -150,7 +144,7 @@ class LabelSheetService {
                       maxLines: 1,
                       overflow: pw.TextOverflow.clip,
                       style: pw.TextStyle(
-                        font: bold,
+                        font: fonts.bold,
                         fontSize: g.common,
                         color: PdfColors.grey800,
                       ),
@@ -159,7 +153,7 @@ class LabelSheetService {
                     label.varietyLabel,
                     maxLines: 2,
                     overflow: pw.TextOverflow.clip,
-                    style: pw.TextStyle(font: bold, fontSize: g.title),
+                    style: pw.TextStyle(font: fonts.bold, fontSize: g.title),
                   ),
                   if (label.scientificName != null)
                     pw.Text(
diff --git a/apps/app_seeds/lib/services/pdf_fonts.dart b/apps/app_seeds/lib/services/pdf_fonts.dart
new file mode 100644
index 0000000..3f5f943
--- /dev/null
+++ b/apps/app_seeds/lib/services/pdf_fonts.dart
@@ -0,0 +1,38 @@
+import 'package:flutter/services.dart' show rootBundle;
+import 'package:pdf/widgets.dart' as pw;
+
+/// Fonts and theme shared by every generated PDF (labels, catalog, recovery
+/// sheet). [theme] is the document-wide default; [bold] is exposed for the few
+/// places that set a heading weight explicitly — merging against [theme] keeps
+/// its script fallbacks, so bold Arabic/CJK still renders.
+typedef PdfFonts = ({pw.ThemeData theme, pw.Font bold});
+
+/// Loads the PDF fonts.
+///
+/// The base face is DejaVu (Latin extended, Cyrillic, Greek) with Noto Arabic
+/// and Noto CJK registered as per-glyph fallbacks, so vernacular species names,
+/// user notes, and localized labels in Arabic (RTL) or CJK render instead of
+/// showing tofu boxes. The `pdf` package subsets fonts to the glyphs actually
+/// used, so bundling the full Noto faces does not bloat the output file.
+///
+/// Fonts are a per-locale resource, extensible to any script — widen the
+/// fallback list as more scripts land.
+Future<PdfFonts> loadPdfFonts() async {
+  final base = pw.Font.ttf(
+    await rootBundle.load('assets/fonts/DejaVuSans.ttf'),
+  );
+  final bold = pw.Font.ttf(
+    await rootBundle.load('assets/fonts/DejaVuSans-Bold.ttf'),
+  );
+  final arabic = pw.Font.ttf(
+    await rootBundle.load('assets/fonts/NotoSansArabic.ttf'),
+  );
+  final cjk = pw.Font.ttf(await rootBundle.load('assets/fonts/NotoSansJP.ttf'));
+  final theme = pw.ThemeData.withFont(
+    base: base,
+    bold: bold,
+    italic: base,
+    fontFallback: [arabic, cjk],
+  );
+  return (theme: theme, bold: bold);
+}
diff --git a/apps/app_seeds/lib/services/recovery_sheet_service.dart b/apps/app_seeds/lib/services/recovery_sheet_service.dart
index ac688c5..b271c74 100644
--- a/apps/app_seeds/lib/services/recovery_sheet_service.dart
+++ b/apps/app_seeds/lib/services/recovery_sheet_service.dart
@@ -1,10 +1,10 @@
 import 'dart:typed_data';
 
-import 'package:flutter/services.dart' show rootBundle;
 import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart' as pw;
 
 import 'file_service.dart';
+import 'pdf_fonts.dart';
 
 /// Renders the printable recovery sheet — a QR plus the typed code and short
 /// instructions ("keep two paper copies, like your best seed"). All strings
@@ -19,22 +19,15 @@ class RecoverySheetService {
     required String intro,
     required String code,
   }) async {
-    final base = pw.Font.ttf(
-      await rootBundle.load('assets/fonts/DejaVuSans.ttf'),
-    );
-    final bold = pw.Font.ttf(
-      await rootBundle.load('assets/fonts/DejaVuSans-Bold.ttf'),
-    );
-    final doc = pw.Document(
-      theme: pw.ThemeData.withFont(base: base, bold: bold),
-    );
+    final fonts = await loadPdfFonts();
+    final doc = pw.Document(theme: fonts.theme);
     doc.addPage(
       pw.Page(
         pageFormat: PdfPageFormat.a4,
         build: (context) => pw.Column(
           crossAxisAlignment: pw.CrossAxisAlignment.start,
           children: [
-            pw.Text(title, style: pw.TextStyle(font: bold, fontSize: 20)),
+            pw.Text(title, style: pw.TextStyle(font: fonts.bold, fontSize: 20)),
             pw.SizedBox(height: 12),
             pw.Text(intro, style: const pw.TextStyle(fontSize: 11)),
             pw.SizedBox(height: 24),
@@ -54,7 +47,7 @@ class RecoverySheetService {
               child: pw.Text(
                 code,
                 textAlign: pw.TextAlign.center,
-                style: pw.TextStyle(font: bold, fontSize: 12),
+                style: pw.TextStyle(font: fonts.bold, fontSize: 12),
               ),
             ),
           ],
diff --git a/apps/app_seeds/lib/services/share_catalog_service.dart b/apps/app_seeds/lib/services/share_catalog_service.dart
index 469a7a3..7979a39 100644
--- a/apps/app_seeds/lib/services/share_catalog_service.dart
+++ b/apps/app_seeds/lib/services/share_catalog_service.dart
@@ -1,10 +1,10 @@
 import 'dart:typed_data';
 
-import 'package:flutter/services.dart' show rootBundle;
 import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart' as pw;
 
 import 'file_service.dart';
+import 'pdf_fonts.dart';
 
 /// One printable line of the "what I share" catalog. All strings arrive
 /// already localized — this service knows nothing about i18n or the domain.
@@ -47,20 +47,13 @@ class ShareCatalogService {
     required String date,
     required List<ShareCatalogRow> rows,
   }) async {
-    final base = pw.Font.ttf(
-      await rootBundle.load('assets/fonts/DejaVuSans.ttf'),
-    );
-    final bold = pw.Font.ttf(
-      await rootBundle.load('assets/fonts/DejaVuSans-Bold.ttf'),
-    );
-    final doc = pw.Document(
-      theme: pw.ThemeData.withFont(base: base, bold: bold, italic: base),
-    );
+    final fonts = await loadPdfFonts();
+    final doc = pw.Document(theme: fonts.theme);
     doc.addPage(
       pw.MultiPage(
         pageFormat: PdfPageFormat.a4,
         build: (context) => [
-          pw.Text(title, style: pw.TextStyle(font: bold, fontSize: 20)),
+          pw.Text(title, style: pw.TextStyle(font: fonts.bold, fontSize: 20)),
           pw.SizedBox(height: 2),
           pw.Text(
             date,
@@ -84,7 +77,7 @@ class ShareCatalogService {
                       children: [
                         pw.Text(
                           row.name,
-                          style: pw.TextStyle(font: bold, fontSize: 12),
+                          style: pw.TextStyle(font: fonts.bold, fontSize: 12),
                         ),
                         if (row.scientificName != null)
                           pw.Text(
diff --git a/apps/app_seeds/lib/ui/inventory_list_screen.dart b/apps/app_seeds/lib/ui/inventory_list_screen.dart
index 890c022..11584ba 100644
--- a/apps/app_seeds/lib/ui/inventory_list_screen.dart
+++ b/apps/app_seeds/lib/ui/inventory_list_screen.dart
@@ -63,7 +63,10 @@ class InventoryListScreen extends StatelessWidget {
                         key: const Key('inventory.search'),
                         decoration: InputDecoration(
                           hintText: t.inventory.searchHint,
-                          prefixIcon: const Icon(Icons.search, color: seedMuted),
+                          prefixIcon: const Icon(
+                            Icons.search,
+                            color: seedMuted,
+                          ),
                           hintStyle: const TextStyle(color: seedMuted),
                           filled: true,
                           fillColor: Colors.white,
@@ -404,15 +407,21 @@ class _FilterBar extends StatelessWidget {
 
     // Lay out the groups in order, dropping a hairline divider between any two
     // that both have chips.
-    final groups = [attrChips, formChips, categoryChips].where((g) => g.isNotEmpty);
+    final groups = [
+      attrChips,
+      formChips,
+      categoryChips,
+    ].where((g) => g.isNotEmpty);
     final row = <Widget>[];
     for (final group in groups) {
       if (row.isNotEmpty) row.add(const _FilterGroupDivider());
       for (final chip in group) {
-        row.add(Padding(
-          padding: const EdgeInsetsDirectional.only(end: 8),
-          child: chip,
-        ));
+        row.add(
+          Padding(
+            padding: const EdgeInsetsDirectional.only(end: 8),
+            child: chip,
+          ),
+        );
       }
     }
     final scroller = EdgeFade(
@@ -451,11 +460,11 @@ class _FilterGroupDivider extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) => Container(
-        width: 1,
-        height: 22,
-        margin: const EdgeInsetsDirectional.only(end: 8),
-        color: seedOutline,
-      );
+    width: 1,
+    height: 22,
+    margin: const EdgeInsetsDirectional.only(end: 8),
+    color: seedOutline,
+  );
 }
 
 /// A [FilterChip] tinted with a [Swatch]: a soft fill when idle, a stronger
@@ -587,7 +596,10 @@ class _CategoryHeader extends StatelessWidget {
             width: 10,
             height: 10,
             margin: const EdgeInsetsDirectional.only(end: 8),
-            decoration: BoxDecoration(color: swatch.ink, shape: BoxShape.circle),
+            decoration: BoxDecoration(
+              color: swatch.ink,
+              shape: BoxShape.circle,
+            ),
           ),
           Flexible(
             // Base on the text theme so it honours the system font-scale factor.
@@ -740,7 +752,7 @@ class _Avatar extends StatelessWidget {
     final trimmed = item.label.trim();
     final initial = trimmed.isEmpty
         ? '?'
-        : trimmed.substring(0, 1).toUpperCase();
+        : trimmed.characters.first.toUpperCase();
     return ExcludeSemantics(
       child: CircleAvatar(
         backgroundColor: seedAvatar,
diff --git a/apps/app_seeds/lib/ui/settings_screen.dart b/apps/app_seeds/lib/ui/settings_screen.dart
index 7fa3586..ff619ef 100644
--- a/apps/app_seeds/lib/ui/settings_screen.dart
+++ b/apps/app_seeds/lib/ui/settings_screen.dart
@@ -59,6 +59,7 @@ List<(AppLocale, String)> _languages(Translations t) => [
   (AppLocale.pt, t.settings.langPt),
   (AppLocale.fr, t.settings.langFr),
   (AppLocale.de, t.settings.langDe),
+  (AppLocale.ja, t.settings.langJa),
 ];
 
 /// A single tile showing the active language; tapping opens a picker with all
diff --git a/apps/app_seeds/lib/ui/theme.dart b/apps/app_seeds/lib/ui/theme.dart
index 60b372c..170a6c2 100644
--- a/apps/app_seeds/lib/ui/theme.dart
+++ b/apps/app_seeds/lib/ui/theme.dart
@@ -52,6 +52,11 @@ ThemeData buildTaneTheme() {
   return ThemeData(
     useMaterial3: true,
     colorScheme: scheme,
+    // Per-glyph script fallbacks so Arabic (RTL) and CJK text render even where
+    // the platform's default font lacks them (notably desktop). The primary
+    // family stays the system default for Latin; these only fill the gaps. The
+    // ranges are disjoint, so order is immaterial. Fonts bundled in pubspec.
+    fontFamilyFallback: const ['Noto Sans JP', 'Noto Sans Arabic'],
     scaffoldBackgroundColor: seedCanvas,
     // Green app bars — aligned with the v2 mockups and the real app.
     appBarTheme: const AppBarTheme(
diff --git a/apps/app_seeds/lib/ui/variety_detail_screen.dart b/apps/app_seeds/lib/ui/variety_detail_screen.dart
index 03e36bb..6eeeead 100644
--- a/apps/app_seeds/lib/ui/variety_detail_screen.dart
+++ b/apps/app_seeds/lib/ui/variety_detail_screen.dart
@@ -147,7 +147,8 @@ class _DetailView extends StatelessWidget {
           if (SeedSavingCatalog.guideFor(
                 scientificName: detail.scientificName,
                 family: detail.family ?? detail.category,
-              ) case final guide? when guide.hasAny) ...[
+              )
+              case final guide? when guide.hasAny) ...[
             const SizedBox(height: 8),
             // Reference data (facts about the species, not the grower's own
             // records) — collapsed by default so it's opt-in depth, not noise.
@@ -301,7 +302,8 @@ class _PlantareLine extends StatelessWidget {
             ? t.plantare.statusReturned
             : t.plantare.statusForgiven,
     ];
-    final overdue = !done &&
+    final overdue =
+        !done &&
         p.dueBy != null &&
         p.dueBy! < DateTime.now().millisecondsSinceEpoch;
     final returnBy = p.dueBy == null
@@ -997,7 +999,9 @@ class _EditVarietySheetState extends State<_EditVarietySheet> {
                           child: Text(
                             t.cropCalendar.editorHint,
                             style: const TextStyle(
-                                color: seedMuted, fontSize: 12),
+                              color: seedMuted,
+                              fontSize: 12,
+                            ),
                           ),
                         ),
                       ),
@@ -1099,9 +1103,13 @@ class _MonthMultiSelect extends StatelessWidget {
   }
 }
 
-/// A short (≤3-char) label for a month name, for the compact calendar chips.
-String _monthAbbrev(String name) =>
-    name.length <= 3 ? name : name.substring(0, 3);
+/// A short (≤3-grapheme) label for a month name, for the compact calendar chips.
+/// Counts by grapheme (not UTF-16 units) so CJK/complex scripts don't truncate
+/// mid-character.
+String _monthAbbrev(String name) {
+  final chars = name.characters;
+  return chars.length <= 3 ? name : chars.take(3).toString();
+}
 
 /// Read-only crop calendar: one line per recorded phase ("Sow · Mar, Apr, Sep").
 /// Renders only the phases that have months set.
@@ -1201,14 +1209,24 @@ class _SeedSavingView extends StatelessWidget {
     }
 
     if ((guide.recommendedPlants ?? guide.minPlants) case final n?) {
-      rows.add(_line(
-          Icons.groups_outlined, t.seedSaving.plants, t.seedSaving.plantsValue(n: n)));
+      rows.add(
+        _line(
+          Icons.groups_outlined,
+          t.seedSaving.plants,
+          t.seedSaving.plantsValue(n: n),
+        ),
+      );
     }
 
     if (guide.processing case final proc?) {
       final wet = proc == SeedProcessing.wet;
-      rows.add(_line(wet ? Icons.water_drop_outlined : Icons.grass,
-          t.seedSaving.processing, wet ? t.seedSaving.procWet : t.seedSaving.procDry));
+      rows.add(
+        _line(
+          wet ? Icons.water_drop_outlined : Icons.grass,
+          t.seedSaving.processing,
+          wet ? t.seedSaving.procWet : t.seedSaving.procDry,
+        ),
+      );
     }
 
     final note = guide.noteFor(LocaleSettings.currentLocale.languageCode);
@@ -1228,10 +1246,16 @@ class _SeedSavingView extends StatelessWidget {
         // Advisory + a light source credit — the figures are general, not local
         // gospel, and drawn from the seed-saving literature.
         const SizedBox(height: 10),
-        Text(t.seedSaving.advisory,
-            style: const TextStyle(
-                color: seedMuted, fontSize: 12, fontStyle: FontStyle.italic)),
-        if (SeedSavingCatalog.sources case final sources when sources.isNotEmpty)
+        Text(
+          t.seedSaving.advisory,
+          style: const TextStyle(
+            color: seedMuted,
+            fontSize: 12,
+            fontStyle: FontStyle.italic,
+          ),
+        ),
+        if (SeedSavingCatalog.sources case final sources
+            when sources.isNotEmpty)
           Padding(
             padding: const EdgeInsets.only(top: 2),
             child: Text(
@@ -1245,23 +1269,28 @@ class _SeedSavingView extends StatelessWidget {
   }
 
   Widget _line(IconData icon, String label, String value) => Padding(
-        padding: const EdgeInsets.symmetric(vertical: 3),
-        child: Row(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Icon(icon, size: 18, color: seedGreen),
-            const SizedBox(width: 10),
-            Expanded(
-              child: Text.rich(TextSpan(children: [
+    padding: const EdgeInsets.symmetric(vertical: 3),
+    child: Row(
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Icon(icon, size: 18, color: seedGreen),
+        const SizedBox(width: 10),
+        Expanded(
+          child: Text.rich(
+            TextSpan(
+              children: [
                 TextSpan(
-                    text: '$label · ',
-                    style: const TextStyle(fontWeight: FontWeight.w600)),
+                  text: '$label · ',
+                  style: const TextStyle(fontWeight: FontWeight.w600),
+                ),
                 TextSpan(text: value),
-              ])),
+              ],
             ),
-          ],
+          ),
         ),
-      );
+      ],
+    ),
+  );
 }
 
 class _DifficultyChip extends StatelessWidget {
@@ -1274,24 +1303,30 @@ class _DifficultyChip extends StatelessWidget {
     final t = context.t;
     final (label, color) = switch (difficulty) {
       SavingDifficulty.easy => (t.seedSaving.diffEasy, const Color(0xFF3B6D11)),
-      SavingDifficulty.medium =>
-        (t.seedSaving.diffMedium, const Color(0xFF8A6D1E)),
+      SavingDifficulty.medium => (
+        t.seedSaving.diffMedium,
+        const Color(0xFF8A6D1E),
+      ),
       SavingDifficulty.hard => (t.seedSaving.diffHard, const Color(0xFFA14234)),
     };
     return Row(
       children: [
         Icon(Icons.insights, size: 18, color: seedGreen),
         const SizedBox(width: 10),
-        Text('${t.seedSaving.difficulty} · ',
-            style: const TextStyle(fontWeight: FontWeight.w600)),
+        Text(
+          '${t.seedSaving.difficulty} · ',
+          style: const TextStyle(fontWeight: FontWeight.w600),
+        ),
         Container(
           padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 2),
           decoration: BoxDecoration(
             color: color.withValues(alpha: 0.14),
             borderRadius: BorderRadius.circular(10),
           ),
-          child: Text(label,
-              style: TextStyle(color: color, fontWeight: FontWeight.w600)),
+          child: Text(
+            label,
+            style: TextStyle(color: color, fontWeight: FontWeight.w600),
+          ),
         ),
       ],
     );
@@ -1324,7 +1359,6 @@ String desiccantLabel(Translations t, DesiccantState d) => switch (d) {
   DesiccantState.fresh => t.desiccant.fresh,
 };
 
-
 /// Single-select chips for the share terms. Gift and swap come first and sale
 /// last, never preselected — the gift is first-class, the sale a choice
 /// (sharing-model §4.1). There is always a selection ("just for me" default).
@@ -1401,7 +1435,7 @@ class _ConditionChecksBlock extends StatelessWidget {
       crossAxisAlignment: CrossAxisAlignment.stretch,
       children: [
         Align(
-          alignment: Alignment.centerLeft,
+          alignment: AlignmentDirectional.centerStart,
           child: Text(
             t.conditionCheck.title,
             style: Theme.of(context).textTheme.labelLarge,
@@ -1428,7 +1462,7 @@ class _ConditionChecksBlock extends StatelessWidget {
               ),
             ),
         Align(
-          alignment: Alignment.centerLeft,
+          alignment: AlignmentDirectional.centerStart,
           child: TextButton.icon(
             key: const Key('conditionCheck.open'),
             icon: const Icon(Icons.add),
@@ -1778,7 +1812,7 @@ Future<void> _showLotSheet(
                         children: [
                           const SizedBox(height: 4),
                           Align(
-                            alignment: Alignment.centerLeft,
+                            alignment: AlignmentDirectional.centerStart,
                             child: Text(
                               t.preservation.title,
                               style: Theme.of(
diff --git a/apps/app_seeds/pubspec.yaml b/apps/app_seeds/pubspec.yaml
index c40545d..fd47a9a 100644
--- a/apps/app_seeds/pubspec.yaml
+++ b/apps/app_seeds/pubspec.yaml
@@ -146,13 +146,26 @@ flutter:
     # Remove before shipping if you don't want them in the bundle.
     - assets/ocr_fixtures/
     # Embedded in generated PDFs (printable catalog). DejaVu covers Latin
-    # (extended), Cyrillic and Greek; like the OCR packs, PDF fonts are a
-    # per-locale resource — swap in wider coverage (Arabic, CJK) as locales
-    # land. Free license (Bitstream Vera / public domain additions).
+    # (extended), Cyrillic and Greek; Noto Arabic + Noto CJK ride alongside as
+    # per-glyph fallbacks so RTL and CJK text render instead of tofu. Fonts are
+    # a per-locale resource, extensible to any script. Licenses: DejaVu
+    # (Bitstream Vera / public domain), Noto (SIL OFL 1.1). See assets/fonts/.
     - assets/fonts/DejaVuSans.ttf
     - assets/fonts/DejaVuSans-Bold.ttf
+    - assets/fonts/NotoSansArabic.ttf
+    - assets/fonts/NotoSansJP.ttf
   fonts:
     # Custom seed-themed icon glyphs (chars a–k). See docs/mockups/seedks-glyphs.png.
     - family: seedks
       fonts:
         - asset: fonts/seedks.ttf
+    # Script coverage fallbacks for the UI text theme (see ui/theme.dart). Noto
+    # (SIL OFL 1.1) covers Arabic (RTL) and CJK (Japanese kanji/kana + shared
+    # Han) so those scripts render on every platform, including desktop where
+    # the system font may lack them. Variable fonts; Flutter picks the weight.
+    - family: Noto Sans Arabic
+      fonts:
+        - asset: assets/fonts/NotoSansArabic.ttf
+    - family: Noto Sans JP
+      fonts:
+        - asset: assets/fonts/NotoSansJP.ttf
diff --git a/apps/app_seeds/test/services/i18n_ja_locale_test.dart b/apps/app_seeds/test/services/i18n_ja_locale_test.dart
new file mode 100644
index 0000000..8de9e37
--- /dev/null
+++ b/apps/app_seeds/test/services/i18n_ja_locale_test.dart
@@ -0,0 +1,31 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:tane/i18n/strings.g.dart';
+
+/// Japanese (`ja`) is the CJK reference locale — fitting, since the app's own
+/// name is Japanese (種, *tane*, "seed"). It proves the CJK path end to end:
+/// the locale is wired, core strings resolve in Japanese, and untranslated
+/// keys fall back to the English base (slang `fallback_strategy: base_locale`).
+void main() {
+  test('ja is a supported locale', () {
+    expect(
+      AppLocaleUtils.supportedLocales.map((l) => l.languageCode),
+      contains('ja'),
+    );
+  });
+
+  test('core strings resolve in Japanese', () {
+    final ja = AppLocale.ja.buildSync();
+    expect(ja.menu.inventory, '在庫');
+    expect(ja.common.save, '保存');
+    expect(ja.settings.langJa, '日本語');
+  });
+
+  test('untranslated keys fall back to the English base', () {
+    final ja = AppLocale.ja.buildSync();
+    final en = AppLocale.en.buildSync();
+    // `menu.plantares` is left untranslated in ja (a coined feature name), so
+    // it must surface the English text rather than a blank or a key.
+    expect(ja.menu.plantares, en.menu.plantares);
+    expect(ja.menu.plantares, isNotEmpty);
+  });
+}
diff --git a/apps/app_seeds/test/services/label_sheet_service_test.dart b/apps/app_seeds/test/services/label_sheet_service_test.dart
index 075e41d..75d58f0 100644
--- a/apps/app_seeds/test/services/label_sheet_service_test.dart
+++ b/apps/app_seeds/test/services/label_sheet_service_test.dart
@@ -76,6 +76,27 @@ void main() {
     expect(String.fromCharCodes(bytes.take(5)), '%PDF-');
   });
 
+  test('buildPdf embeds CJK and Arabic glyphs (no tofu)', () async {
+    // Japanese (CJK) and Arabic (RTL) fall outside DejaVu's coverage; the Noto
+    // fallbacks in the PDF theme must render them without throwing. Guards
+    // against a regression that drops the fallback fonts.
+    final service = LabelSheetService(files: _RecordingFileService());
+    final bytes = await service.buildPdf(
+      labels: const [
+        LabelSheetLabel(
+          varietyLabel: '日本の在来種のトマト',
+          commonName: 'トマト',
+          scientificName: 'Solanum lycopersicum',
+          qrData: 'tane://seed?v=tomato',
+        ),
+        LabelSheetLabel(varietyLabel: 'طماطم بلدية', qrData: 'tane://seed?v=x'),
+      ],
+      format: LabelSheetFormat.cards,
+    );
+    expect(String.fromCharCodes(bytes.take(5)), '%PDF-');
+    expect(bytes.length, greaterThan(1000));
+  });
+
   test('saveLabels hands the PDF to the save dialog', () async {
     final files = _RecordingFileService();
     final service = LabelSheetService(files: files);
diff --git a/docs/i18n.md b/docs/i18n.md
index cfc5b6b..400dbf8 100644
--- a/docs/i18n.md
+++ b/docs/i18n.md
@@ -10,11 +10,15 @@ speaks nested JSON) handles natively.
 ```
 apps/app_seeds/lib/i18n/
   en.i18n.json   ← base locale (source of truth for keys)
-  es.i18n.json
-  pt.i18n.json
+  es.i18n.json   ast, pt, fr, de, ja …
   strings*.g.dart  ← generated, do not edit
 ```
 
+Live locales: `es`, `ast`, `en`, `pt`, `fr`, `de`, `ja`. Japanese (`ja`) is the
+CJK reference — fittingly, the app's own name is Japanese (種, *tane*, "seed").
+It ships only a core set of strings translated; the rest fall back to English,
+which is exactly how a partial locale is meant to grow.
+
 - Placeholders use braces: `"{count} entries added"`. Keep them verbatim.
 - Keys are code and never change per locale; only values are translated.
 - Missing keys fall back to English at runtime (`fallback_strategy:
@@ -41,6 +45,16 @@ apps/app_seeds/lib/i18n/
 Right-to-left locales (Arabic, Hebrew, Persian) are first-class: layouts use
 directional insets and are exercised by
 [`rtl_smoke_test.dart`](../apps/app_seeds/test/ui/rtl_smoke_test.dart).
+
+**Fonts cover the scripts we claim.** The UI text theme carries Noto Sans
+Arabic + Noto Sans JP as per-glyph fallbacks (see
+[`theme.dart`](../apps/app_seeds/lib/ui/theme.dart)), so RTL and CJK render on
+every platform — including desktop, where the system font may lack them. Every
+generated PDF shares the same fallbacks via
+[`pdf_fonts.dart`](../apps/app_seeds/lib/services/pdf_fonts.dart), so labels and
+catalogs print Arabic/CJK instead of tofu. Fonts are a per-locale resource,
+extensible to any script; widen the fallback list as more scripts land.
+
 Locale-specific resources ship with their locale, never hardcoded: OCR
 language packs (`assets/tessdata/`), PDF fonts (`assets/fonts/`), and species
 common names (`assets/catalog/species.json`, a locale-keyed map).