# Language Management Improvements - v3.0.0-beta

**Date:** October 10, 2025  
**Status:** ✅ Implemented

---

## Overview

Complete overhaul of the language management system with dropdown menus, swap functionality, and customizable language lists.

---

## New Features

### 1. **Default Language List** (50+ Languages)
- Pre-loaded with 50+ common languages
- Alphabetically sorted
- User-editable

**Default Languages Include:**
- European: Dutch, English, French, German, Spanish, Italian, Portuguese, etc.
- Asian: Chinese (Simplified/Traditional), Japanese, Korean, Hindi, Thai, Vietnamese, etc.
- Middle Eastern: Arabic, Hebrew, Persian, Turkish, Urdu
- African: Swahili
- Celtic: Irish, Welsh
- And many more...

### 2. **Dynamic Settings Pane Display**
**Fixed:** Language changes now update immediately in the Settings tab

**Before:**
- Static labels showing initial values
- Changes not reflected until restart

**After:**
- Uses `StringVar` for dynamic updates
- Settings pane refreshes instantly when languages change

**Implementation:**
```python
self.settings_source_lang_display = tk.StringVar(value=self.source_language)
self.settings_target_lang_display = tk.StringVar(value=self.target_language)
```

### 3. **Dropdown Language Selection**
**Replaced:** Text entry fields → Dropdown combo boxes

**Benefits:**
- ✅ No typos (readonly dropdown)
- ✅ Consistent language names
- ✅ Easy browsing of available languages
- ✅ Professional UX

**Dialog Features:**
- Source language dropdown
- Target language dropdown
- Inline swap button (🔄)
- Helpful tip about editing language list

### 4. **Quick Swap Button**
**New Button in Settings Tab:** 🔄 Swap

**Functionality:**
- One-click reversal of source ↔ target
- Instantly updates Settings pane
- Logs the change

**Use Cases:**
- Back-translation
- Checking reverse direction
- Quick language pair switching

### 5. **Editable Language List**
**New Button in Settings Tab:** ✏️ Edit Language List

**Features:**
- Full-screen text editor for language list
- One language per line
- Alphabetically sorted on save
- Reset to Defaults button
- Validation (prevents empty list)

**Editor Interface:**
```
Available Languages
Edit the list below (one language per line):

[Text area with current languages]

[Reset to Defaults] [Cancel] [Save]
```

---

## User Workflows

### Basic Language Change
1. Click **🌍 Change Languages**
2. Select from dropdowns
3. Click **Save**
4. ✅ Settings pane updates immediately

### Quick Swap
1. Click **🔄 Swap** in Settings tab
2. ✅ Languages reversed instantly
3. ✅ Logged in activity log

### Add Custom Language
1. Click **✏️ Edit Language List**
2. Add new language(s)
3. Click **Save**
4. ✅ New language available in dropdowns

### Remove Unwanted Languages
1. Click **✏️ Edit Language List**
2. Delete unwanted lines
3. Click **Save**
4. ✅ Dropdown list simplified

---

## Technical Details

### Language List Storage
```python
self.available_languages = [
    "Afrikaans", "Albanian", "Arabic", ..., "Welsh"
]
```

### Dynamic Updates
All changes update three places simultaneously:
1. Internal variables (`self.source_language`, `self.target_language`)
2. Settings pane labels (via `StringVar`)
3. Activity log

### Validation
- Language list cannot be empty
- Dropdown selections validated (readonly)
- Sorted alphabetically for consistency

---

## Benefits

### For Users
- ✅ **Easier:** Dropdown selection vs. typing
- ✅ **Faster:** One-click swap
- ✅ **Cleaner:** See only languages you use
- ✅ **Professional:** No typos or inconsistencies

### For Translators
- ✅ **Quick direction changes:** Swap button
- ✅ **Custom lists:** Add rare language pairs
- ✅ **Workflow optimization:** Remove unused languages

### For Developers
- ✅ **Maintainable:** Centralized language list
- ✅ **Extensible:** Easy to add more languages
- ✅ **Consistent:** Single source of truth

---

## UI Changes Summary

### Settings Tab (Language Section)
**Before:**
```
Source: English
Target: Dutch
[🌍 Change Languages]
```

**After:**
```
Source: English
Target: Dutch
[🌍 Change Languages] [🔄 Swap] [✏️ Edit Language List]
```

### Language Settings Dialog
**Before:**
```
Source Language: [____________]  (text entry)
Target Language: [____________]  (text entry)
[Save] [Cancel]
```

**After:**
```
Translation Language Pair

Source Language: [English        ▼]  [🔄]
Target Language: [Dutch          ▼]

💡 Tip: Use 'Edit Language List' in Settings to customize

[Save] [Cancel]
```

---

## Code Changes

### Files Modified
- `Supervertaler_v3.0.0-beta_CAT.py`

### Functions Added
1. `swap_languages()` - Swap source/target with UI updates
2. `edit_language_list()` - Full language list editor
3. Modified `show_language_settings()` - Dropdown-based dialog
4. Modified `create_settings_tab()` - Added swap & edit buttons, dynamic labels

### Lines Changed
- **Added:** ~150 lines
- **Modified:** ~30 lines
- **Total Impact:** ~180 lines

---

## Future Enhancements (Optional)

### Potential Additions
- 🔮 **Language detection:** Auto-detect source language
- 🔮 **Recent pairs:** Quick access to recently used pairs
- 🔮 **Favorites:** Star frequently used language pairs
- 🔮 **Import/Export:** Share custom language lists
- 🔮 **Language codes:** Display ISO codes (en, nl, fr, etc.)

---

## Testing Checklist

- [x] Language dropdowns populate correctly
- [x] Swap button reverses languages
- [x] Settings pane updates dynamically
- [x] Edit language list saves changes
- [x] Reset to defaults works
- [x] Empty list validation works
- [x] Language selection persists
- [x] Log messages display correctly

---

## Related Issues

**Fixed:**
- ✅ Language changes not reflected in Settings pane
- ✅ No quick way to reverse language pair
- ✅ Typing errors in language names
- ✅ No way to customize language list

**Also Fixed:**
- ✅ LLM model display issue (separate fix)

---

**Implementation Date:** October 10, 2025  
**Version:** v3.0.0-beta  
**Status:** Ready for testing
