The RN overlay (`locales/rn/en.json`, the strings the webmail catalog
does not carry) only existed in English, so those 600 or so labels
showed in English whatever language the app was set to.
- load `locales/rn/<lang>.json` for every language next to its
vendored catalog; an untranslated key still falls back to English
- a test keeps each translation to English keys and the same ICU
arguments
- `node scripts/rn-missing-translations.mjs [lang]` lists what a
language still lacks
Linus Rath
008bff29f8