Add 18 previously missing language entries to SUPPORTED_LANGUAGES in
app/utils/i18n.py so every translation JSON file in frontend/translations/
is properly indexed and served by the language selector:
New languages: af, ar, cy, eo, fa, fy, gl, he, ja, kn, ko, li, nds, no, pa, sr, vi, vls
Each new language entry includes:
- Correct ISO 639-1/639-3 code matching its JSON filename
- Native name and display name
- Appropriate country/language flag emoji
- Locale-specific date and number formatting rules in _LOCALE_FORMATS
Also: rename nb "Norwegian" → "Norwegian Bokmål" to distinguish it from no "Norwegian".
Update tests/test_i18n.py:
- Count assertions: 31 → 49
- Expected code set expanded to all 49 codes
- Fix test_unsupported_language_fallback (ja/ko now supported, use xx/yy)
Update docs/InternationalizationGuide.md:
- Language count: 10 → 49
- Full language table with flags, native names, tiers
- Complete file structure listing all 49 JSON files
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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