deps: i18next 10 -> 23, react-i18next 7 -> 14

Modernizes the whole i18n stack:
- 48 translate([], {wait:true}) / translate() HOCs -> withTranslation()
- react.wait:true -> react.useSuspense:false
- whitelist -> supportedLngs; added compatibilityJSON: 'v3' so our
  natural-language keys + v3 _plural layout keep working (custom
  separators ss/eth/dj preserved)
- backends: xhr -> i18next-http-backend (client), sync-fs ->
  i18next-fs-backend (server); dropped i18next-localstorage-cache
  (was enabled:false); languagedetector 2 -> 8
- ReSendEmail: <Interpolate> (removed in v10) -> <Trans values={{email}}/>,
  dropped the removed bare t export
- saveMissing handler signature (lngs, ns, key, fallbackValue)

Silences the per-component Translate/I18n legacy-context warnings.
Browser-verified es/en switch and <Trans> interpolation on /fires;
REST smoke byte-identical.

imports/ui/components/Maps/DefMapLayers.js

@@ -4,7 +4,7 @@
 
 import React, { Component } from 'react';
 import PropTypes from 'prop-types';
-import { translate } from 'react-i18next';
+import { withTranslation } from 'react-i18next';
 import { GoogleLayer } from 'react-leaflet-google/lib/';
 import Gkeys from '/imports/startup/client/Gkeys';
 import { TileLayer, LayersControl } from 'react-leaflet';
@@ -85,4 +85,4 @@ DefMapLayers.defaultProps = {
   satellite: false
 };
 
-export default translate([], { wait: true })(DefMapLayers);
+export default withTranslation()(DefMapLayers);