## 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/layout.mustache

@@ -25,6 +25,133 @@
     <link href="/assets/css/bootstrap.min.css" rel="stylesheet">
     <link href="/assets/css/bootstrap-icons.css" rel="stylesheet">
     <link href="/assets/css/style.css" rel="stylesheet">
+    <link href="/assets/css/mobile.css" rel="stylesheet">
+    
+    <!-- Dynamic theme colors -->
+    <style>
+        :root {
+            --header-bg: {{header_color}};
+            --header-font: {{header_font_color}};
+            --nav-bg: {{navigation_color}};
+            --nav-font: {{navigation_font_color}};
+        }
+        
+        /* Header styles */
+        .navbar {
+            background-color: var(--header-bg) !important;
+        }
+        
+        .navbar .navbar-brand,
+        .navbar .navbar-text,
+        .navbar .form-control,
+        .navbar .btn {
+            color: var(--header-font) !important;
+        }
+        
+        .navbar .form-control::placeholder {
+            color: rgba(255,255,255,0.7) !important;
+        }
+        
+        .navbar .btn-outline-light {
+            border-color: var(--header-font) !important;
+        }
+        
+        /* Language dropdown styling */
+        .dropdown-menu {
+            background-color: var(--header-bg) !important;
+            border: 1px solid var(--header-font) !important;
+        }
+        
+        .dropdown-item {
+            color: var(--header-font) !important;
+        }
+        
+        .dropdown-item:hover {
+            background-color: rgba(255,255,255,0.1) !important;
+            color: var(--header-font) !important;
+        }
+        
+        /* Hide Bootstrap dropdown arrow and use custom icon */
+        .dropdown-toggle::after {
+            display: none !important;
+        }
+        
+        .btn-outline-light {
+            color: var(--header-font) !important;
+            border-color: var(--header-font) !important;
+        }
+        
+        .btn-outline-light:hover {
+            background-color: rgba(255,255,255,0.1) !important;
+            color: var(--header-font) !important;
+        }
+        
+        /* Fix button color when dropdown is open */
+        .btn-outline-light:focus,
+        .btn-outline-light:active,
+        .show > .btn-outline-light.dropdown-toggle {
+            background-color: rgba(255,255,255,0.1) !important;
+            color: var(--header-font) !important;
+            border-color: var(--header-font) !important;
+            box-shadow: none !important;
+        }
+        
+        .bi-chevron-down {
+            font-size: 0.75em;
+            margin-left: 0.25rem;
+        }
+        
+        /* Remove Bootstrap default breadcrumb separators */
+        .breadcrumb-item + .breadcrumb-item::before {
+            content: "" !important;
+            padding: 0 !important;
+        }
+        
+        /* Custom breadcrumb styling */
+        .breadcrumb {
+            --bs-breadcrumb-divider: "";
+        }
+        
+        .breadcrumb-item {
+            color: var(--nav-font) !important;
+        }
+        
+        .breadcrumb-item a {
+            color: var(--nav-font) !important;
+            text-decoration: none;
+        }
+        
+        .breadcrumb-item a:hover {
+            text-decoration: underline;
+        }
+        
+        /* Navigation section background */
+        .navigation-section {
+            background-color: var(--nav-bg) !important;
+            color: var(--nav-font) !important;
+        }
+        
+        /* Remove nav-tabs background so it inherits from parent */
+        .nav-tabs {
+            background-color: transparent !important;
+            border: none !important;
+        }
+        
+        .nav-tabs .nav-link {
+            background-color: transparent !important;
+            border: none !important;
+            color: var(--nav-font) !important;
+        }
+        
+        .nav-tabs .nav-link:hover {
+            background-color: rgba(255,255,255,0.1) !important;
+        }
+        
+        .nav-tabs .nav-link.active {
+            background-color: rgba(255,255,255,0.2) !important;
+            border-bottom: 2px solid var(--nav-font) !important;
+        }
+    </style>
 </head>
 <body>
     {{>header}}