## 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.

config.json

@@ -1,12 +1,18 @@
 {
     "site_title": "CodePress",
-    "content_dir": "public/content",
+    "content_dir": "content",
     "templates_dir": "engine/templates",
     "default_page": "welkom",
 
     "theme": {
-        "primary_color": "#0d6efd",
-        "navbar_style": "bg-primary"
+        "header_color": "#0a369d",
+        "header_font_color": "#ffffff",
+        "navigation_color": "#2754b4",
+        "navigation_font_color": "#ffffff"
+    },
+    "language": {
+        "default": "nl",
+        "available": ["nl", "en"]
     },
     "seo": {
         "description": "CodePress CMS - Lightweight file-based content management system",
@@ -22,4 +28,4 @@
         "search_enabled": true,
         "breadcrumbs_enabled": true
     }
-}
+}