Weblate has no native Hugo-TOML format. The strings are already the go-i18n
structure ([key]/other=), so convert site/i18n/{en,es}.toml -> {en,es}.json
({"key":{"other":"..."}}) — Hugo 0.140 reads it identically (verified with the
pinned hugomods/hugo:exts-0.140.2 image). Enables a 'site' Weblate component.
Update TRANSLATIONS.md: site is now a component (go-i18n-json), not deferred.
