feat(i18n): expand supported languages from 31 to 49 with flags and locale formats
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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# Internationalization (i18n) & Localization (l10n) Guide
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DocuElevate supports **10 languages** for its web UI, with automatic browser
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DocuElevate supports **49 languages** for its web UI, with automatic browser
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language detection, user-preference persistence, and an AI-powered fallback
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translator for strings that haven't been manually translated yet.
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## Supported Languages
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| Code | Language | Native Name | Priority |
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|------|------------|-------------|----------|
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| `en` | English | English | Tier 1 |
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| `de` | German | Deutsch | Tier 1 |
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| `fr` | French | Français | Tier 1 |
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| `es` | Spanish | Español | Tier 1 |
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| `it` | Italian | Italiano | Tier 1 |
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| `pt` | Portuguese | Português | Tier 1 |
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| `nl` | Dutch | Nederlands | Tier 2 |
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| `pl` | Polish | Polski | Tier 2 |
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| `zh` | Chinese | 中文 | Tier 2 |
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| `ru` | Russian | Русский | Tier 2 |
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| Code | Language | Native Name | Flag | Priority |
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|-------|------------------|--------------------|------|----------|
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| `en` | English | English | 🇬🇧 | Tier 1 |
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| `de` | German | Deutsch | 🇩🇪 | Tier 1 |
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| `fr` | French | Français | 🇫🇷 | Tier 1 |
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| `es` | Spanish | Español | 🇪🇸 | Tier 1 |
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| `it` | Italian | Italiano | 🇮🇹 | Tier 1 |
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| `pt` | Portuguese | Português | 🇵🇹 | Tier 1 |
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| `nl` | Dutch | Nederlands | 🇳🇱 | Tier 2 |
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| `nb` | Norwegian Bokmål | Norsk bokmål | 🇳🇴 | Tier 2 |
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| `no` | Norwegian | Norsk | 🇳🇴 | Tier 2 |
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| `da` | Danish | Dansk | 🇩🇰 | Tier 2 |
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| `sv` | Swedish | Svenska | 🇸🇪 | Tier 2 |
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| `fi` | Finnish | Suomi | 🇫🇮 | Tier 2 |
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| `is` | Icelandic | Íslenska | 🇮🇸 | Tier 2 |
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| `ga` | Irish | Gaeilge | 🇮🇪 | Tier 2 |
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| `lb` | Luxembourgish | Lëtzebuergesch | 🇱🇺 | Tier 2 |
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| `ca` | Catalan | Català | 🏴 | Tier 2 |
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| `cy` | Welsh | Cymraeg | 🏴 | Tier 2 |
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| `fy` | Frisian | Frysk | 🇳🇱 | Tier 2 |
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| `gl` | Galician | Galego | 🇪🇸 | Tier 2 |
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| `li` | Limburgish | Limburgs | 🇳🇱 | Tier 2 |
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| `vls` | West Flemish | West-Vlams | 🇧🇪 | Tier 2 |
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| `nds` | Low German | Plattdüütsch | 🇩🇪 | Tier 2 |
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| `pl` | Polish | Polski | 🇵🇱 | Tier 3 |
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| `cs` | Czech | Čeština | 🇨🇿 | Tier 3 |
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| `sk` | Slovak | Slovenčina | 🇸🇰 | Tier 3 |
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| `hu` | Hungarian | Magyar | 🇭🇺 | Tier 3 |
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| `sl` | Slovenian | Slovenščina | 🇸🇮 | Tier 3 |
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| `hr` | Croatian | Hrvatski | 🇭🇷 | Tier 3 |
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| `ro` | Romanian | Română | 🇷🇴 | Tier 3 |
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| `bg` | Bulgarian | Български | 🇧🇬 | Tier 3 |
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| `el` | Greek | Ελληνικά | 🇬🇷 | Tier 3 |
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| `et` | Estonian | Eesti | 🇪🇪 | Tier 3 |
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| `lv` | Latvian | Latviešu | 🇱🇻 | Tier 3 |
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| `lt` | Lithuanian | Lietuvių | 🇱🇹 | Tier 3 |
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| `sr` | Serbian | Српски | 🇷🇸 | Tier 3 |
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| `tr` | Turkish | Türkçe | 🇹🇷 | Tier 4 |
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| `uk` | Ukrainian | Українська | 🇺🇦 | Tier 4 |
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| `ru` | Russian | Русский | 🇷🇺 | Tier 4 |
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| `he` | Hebrew | עברית | 🇮🇱 | Tier 4 |
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| `ar` | Arabic | العربية | 🇸🇦 | Tier 4 |
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| `fa` | Persian | فارسی | 🇮🇷 | Tier 4 |
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| `af` | Afrikaans | Afrikaans | 🇿🇦 | Tier 4 |
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| `zh` | Chinese | 中文 | 🇨🇳 | Tier 5 |
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| `ja` | Japanese | 日本語 | 🇯🇵 | Tier 5 |
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| `ko` | Korean | 한국어 | 🇰🇷 | Tier 5 |
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| `vi` | Vietnamese | Tiếng Việt | 🇻🇳 | Tier 5 |
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| `pa` | Punjabi | ਪੰਜਾਬੀ | 🇮🇳 | Tier 5 |
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| `kn` | Kannada | ಕನ್ನಡ | 🇮🇳 | Tier 5 |
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| `eo` | Esperanto | Esperanto | 🌍 | Tier 6 |
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> **Tier 1** languages (European priority) have complete, manually-reviewed
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> translations. **Tier 2** languages have complete translations but may
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> receive less frequent updates.
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> **Tier 1** languages (major European) have complete, manually-reviewed
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> translations. **Tier 2–3** languages have complete translations but may
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> receive less frequent updates. **Tier 4–5** cover Non-EU European, Middle
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> Eastern, and Asian languages. **Tier 6** covers constructed languages.
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## How Language Is Detected
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@@ -71,15 +111,54 @@ Translations are stored as flat JSON files in `frontend/translations/`:
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```
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frontend/translations/
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├── en.json # English (base / reference)
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├── af.json # Afrikaans
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├── ar.json # Arabic
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├── bg.json # Bulgarian
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├── ca.json # Catalan
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├── cs.json # Czech
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├── cy.json # Welsh
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├── da.json # Danish
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├── de.json # German
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├── fr.json # French
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├── el.json # Greek
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├── eo.json # Esperanto
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├── es.json # Spanish
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├── et.json # Estonian
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├── fa.json # Persian
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├── fi.json # Finnish
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├── fr.json # French
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├── fy.json # Frisian
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├── ga.json # Irish
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├── gl.json # Galician
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├── he.json # Hebrew
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├── hr.json # Croatian
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├── hu.json # Hungarian
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├── is.json # Icelandic
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├── it.json # Italian
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├── pt.json # Portuguese
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├── ja.json # Japanese
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├── kn.json # Kannada
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├── ko.json # Korean
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├── lb.json # Luxembourgish
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├── li.json # Limburgish
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├── lt.json # Lithuanian
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├── lv.json # Latvian
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├── nb.json # Norwegian Bokmål
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├── nds.json # Low German (Plattdeutsch)
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├── nl.json # Dutch
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├── no.json # Norwegian
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├── pa.json # Punjabi
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├── pl.json # Polish
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├── zh.json # Chinese
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└── ru.json # Russian
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├── pt.json # Portuguese
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├── ro.json # Romanian
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├── ru.json # Russian
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├── sk.json # Slovak
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├── sl.json # Slovenian
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├── sr.json # Serbian
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├── sv.json # Swedish
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├── tr.json # Turkish
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├── uk.json # Ukrainian
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├── vi.json # Vietnamese
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├── vls.json # West Flemish
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└── zh.json # Chinese
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```
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Each file is a flat key-value dictionary with dot-notation namespacing:
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