docs: document translation system and update ui-translations module

journal.rst

@@ -17,4 +17,105 @@ Built `token_estimator.js` - a simplified BPE-based token counter for translatio
 - Generation: 121 tokens/sec  
 - Translation estimates: 1K tokens ≈ 11 seconds
 
-The estimator uses real production metrics from our Hermes machine to provide realistic translation timing.
+The estimator uses real production metrics from our Hermes machine to provide realistic translation timing.
+
+July 3, 2025
+============
+
+Complete Translation Infrastructure Overhaul
+--------------------------------------------
+
+**Modular Language System Implementation**
+
+Restructured the entire translation system to use individual language files instead of one monolithic object. Each of the 19 supported languages now has its own dedicated JS file in `/src/languages/`.
+
+**Language Coverage:**
+- 🇺🇸 English (en.js) - 46 translation keys
+- 🇨🇳 Chinese Simplified (zh.js) 
+- 🇹🇼 Chinese Traditional (zh-tw.js)
+- 🇮🇳 Hindi (hi.js)
+- 🇪🇸 Spanish (es.js) 
+- 🇫🇷 French (fr.js)
+- 🇸🇦 Arabic (ar.js)
+- 🇧🇩 Bengali (bn.js)
+- 🇷🇺 Russian (ru.js)
+- 🇧🇷 Portuguese (pt.js)
+- 🇵🇰 Urdu (ur.js)
+- 🇮🇩 Indonesian (id.js)
+- 🇩🇪 German (de.js)
+- 🇯🇵 Japanese (ja.js)
+- 🇰🇪 Swahili (sw.js)
+- 🇮🇳 Marathi (mr.js)
+- 🇮🇳 Telugu (te.js)
+- 🇹🇷 Turkish (tr.js)
+- 🇰🇷 Korean (ko.js)
+
+**Dynamic UI Refresh System**
+
+Implemented `refreshUILanguage()` function that updates all UI text without requiring browser refresh:
+
+- **Declarative translations**: Elements with `data-i18n` attributes automatically update
+- **Parameter support**: `data-i18n-params` for dynamic text with variables like `{lang}` and `{error}`
+- **Smart element detection**: Handles inputs, buttons, placeholders, and modal titles
+- **Event system**: Dispatches `languageChanged` custom events for component integration
+- **Backward compatibility**: Maintains `window.refreshUILanguage` for existing code
+
+**Translation Verification System**
+
+Created `verify-translations.js` - a Node.js script that ensures translation consistency:
+
+- **Key extraction**: Parses JS files to extract translation object keys  
+- **Completeness verification**: Compares all languages against English reference
+- **Missing/extra key detection**: Reports inconsistencies with colored console output
+- **Exit codes**: Returns 0 for success, 1 for issues (CI/CD friendly)
+
+**Adding New Languages - Workflow:**
+
+1. **Before adding**: Run verification to ensure current state is clean
+   ```bash
+   cd /home/fox/git/ai.unturf.com/src/languages
+   node verify-translations.js
+   ```
+   Should show: "🎉 All languages have complete translations!"
+
+2. **Create new language file**: Copy structure from `en.js`
+   ```bash
+   cp en.js new-lang.js  # Replace 'new-lang' with actual language code
+   ```
+
+3. **Translate all values**: Keep the same keys, translate only the string values
+
+4. **Update index.js**: Add import and export for the new language
+   ```javascript
+   import { newLang } from "./new-lang.js";
+   // Add to UI_TRANSLATIONS object
+   ```
+
+5. **Verify completeness**: Run script again to check for issues
+   ```bash
+   node verify-translations.js
+   ```
+   
+6. **Fix any issues**: Script will show missing/extra keys in red
+   - Missing keys: Add them with proper translations
+   - Extra keys: Remove them or add to English reference if needed
+
+7. **Final verification**: Run until you see the success message again
+
+**File Structure:**
+```
+src/languages/
+├── index.js              # Aggregates all translations
+├── en.js                 # English reference (46 keys)
+├── [18 other languages]  # Complete translations
+└── verify-translations.js # Sanity check script
+```
+
+**Benefits:**
+- **Maintainability**: Each language isolated in its own file
+- **Consistency**: 100% key coverage verified across all 19 languages  
+- **Real-time UX**: Language switching without page refresh
+- **Developer experience**: Automated verification prevents translation drift
+- **Scalability**: Easy to add new languages following the established pattern
+
+This system supports the full user journey from language detection to dynamic interface updates, ensuring a seamless multilingual experience for all Hermes AI users.