## Complete Multi-language System & Navigation Enhancement

### Features Added:
- **Multi-language Support**: Dutch/English with URL-based switching (?lang=nl|en)
- **Theme Customization**: Configurable header/navigation colors via config.json
- **Navigation Improvements**: Active states, dropdown chevron icons, visual distinction
- **Mobile Responsive**: Separate desktop/mobile search layouts
- **Template System**: Fixed rendering pipeline for all partials

### Technical Fixes:
- Fixed language file path (engine/lang/ vs engine/core/class/../lang/)
- Added template data rendering to layout template
- Implemented navigation active state for default/home page
- Added chevron icons to dropdown folders for visual distinction
- Removed hardcoded navigation opacity class for theme colors

### Files Modified:
- config.json: Added theme and language configuration
- engine/core/class/CodePressCMS.php: Multi-language and navigation logic
- engine/templates/: Enhanced header, footer, navigation, layout
- engine/lang/: Dutch and English translation files
- public/assets/css/mobile.css: Mobile responsive fixes

### Result:
Fully functional multi-language CMS with proper navigation states and theme customization.

engine/templates/assets/footer.mustache

@@ -10,11 +10,11 @@
                     </div>
                     <div class="site-info">
                         <small class="text-muted">
-                            <a href="?guide" class="guide-link" title="Handleiding">
+                            <a href="?guide" class="guide-link" title="{{t_guide}}">
                                 <i class="bi bi-book"></i>
                             </a>
                             <span class="ms-2">|</span>
-                            Powered by <a href="https://git.noorlander.info/E.Noorlander/CodePress.git" target="_blank" rel="noopener">CodePress CMS</a>
+                            {{t_powered_by}} <a href="https://git.noorlander.info/E.Noorlander/CodePress.git" target="_blank" rel="noopener">CodePress CMS</a>
                         </small>
                     </div>
                 </div>