v2.6.0: Content backup/git versioning, plugin type system, docs update

New features:
- ContentBackup class with ZIP backup/restore and git versioning
- Admin backup & restore page (content-backup.twig) with git init/commit/log/restore
- Plugin type system: system (blue) vs content (green) with visual badges
- PluginAPIInterface + AdminPluginAPI for plugin architecture
- Essential plugin flag (cannot edit/deactivate/delete)

Improvements:
- Consolidated enabled_plugins config (removed plugins.enabled)
- Removed Analytics/Logging toggles from admin config page
- Fixed Dashboard plugin Twig comments rendered as text
- Updated 20 guide files (NL+EN): configuratie, plugins, plugin-development,
  core-classes, theme-json, layouts, scss-styling, admin-beheerder, nieuw-thema, architectuur
- Improved accessibility test script (grep -E, min/max checks)

Cleanup:
- Removed unused classes: ARIAComponents, AccessibilityManager, ContentSecurityPolicy, etc.
- Removed vendor packages: mustache/mustache, php-mqtt/client
- Removed old templates: logs.twig, statistics.twig (now plugins)
- Moved language files to language/ directory

Tests:
- Pentest: 30/30 passed, 0 vulnerabilities
- WCAG 2.1 AA: 25/25 passed, 100% compliance

cms/core/class/CodePressCMS.php

@@ -146,26 +146,31 @@ class CodePressCMS {
     }
     
     /**
-     * Get all available languages from lang directory
+     * Get all available languages from the language directory
+     * 
+     * Each language is a subdirectory under language/ containing a site.php file.
      * 
      * @return array Available languages with their codes and names
      */
     public function getAvailableLanguages() {
-        $langDir = __DIR__ . '/../../lang/';
+        $langDir = __DIR__ . '/../../../language/';
         $languages = [];
         
         if (!is_dir($langDir)) {
             return $languages;
         }
         
-        $files = scandir($langDir);
-        foreach ($files as $file) {
-            if (preg_match('/^([a-z]{2})\.php$/', $file, $matches)) {
-                $langCode = $matches[1];
-                $langFile = $langDir . $file;
+        $entries = scandir($langDir);
+        foreach ($entries as $entry) {
+            if (preg_match('/^[a-z]{2}$/', $entry) && is_dir($langDir . $entry)) {
+                $langCode = $entry;
+                $siteFile = $langDir . $entry . '/site.php';
                 
-                if (file_exists($langFile)) {
-                    $translations = include $langFile;
+                if (file_exists($siteFile)) {
+                    $translations = include $siteFile;
+                    if (!is_array($translations)) {
+                        continue;
+                    }
                     $languages[$langCode] = [
                         'code' => $langCode,
                         'name' => $translations['site_title'] ?? strtoupper($langCode),
@@ -179,22 +184,28 @@ class CodePressCMS {
     }
     
     /**
-     * Load translations for specified language
+     * Load site translations for specified language
      * 
      * @param string $lang Language code
      * @return array Translations array
      */
     private function loadTranslations($lang) {
-        $langFile = __DIR__ . '/../../lang/' . $lang . '.php';
+        $langDir = __DIR__ . '/../../../language/';
+        $langFile = $langDir . $lang . '/site.php';
         if (file_exists($langFile)) {
             $translations = include $langFile;
-            return $translations;
+            if (is_array($translations)) {
+                return $translations;
+            }
         }
         // Fallback to default language
         $defaultLang = $this->config['language']['default'] ?? 'nl';
-        $defaultLangFile = __DIR__ . '/../../lang/' . $defaultLang . '.php';
+        $defaultLangFile = $langDir . $defaultLang . '/site.php';
         if (file_exists($defaultLangFile)) {
-            return include $defaultLangFile;
+            $translations = include $defaultLangFile;
+            if (is_array($translations)) {
+                return $translations;
+            }
         }
         // Return empty array if no translation found
         return [];
@@ -208,19 +219,77 @@ class CodePressCMS {
      */
     private function getNativeLanguageName($langCode) {
         $names = [
-            'nl' => 'Nederlands',
-            'en' => 'English',
-            'fr' => 'Français',
+            'af' => 'Afrikaans',
+            'am' => 'አማርኛ',
+            'ar' => 'العربية',
+            'az' => 'Azərbaycan',
+            'bg' => 'Български',
+            'bn' => 'বাংলা',
+            'bs' => 'Bosanski',
+            'ca' => 'Català',
+            'cs' => 'Čeština',
+            'da' => 'Dansk',
             'de' => 'Deutsch',
+            'el' => 'Ελληνικά',
+            'en' => 'English',
             'es' => 'Español',
+            'et' => 'Eesti',
+            'eu' => 'Euskara',
+            'fa' => 'فارسی',
+            'fi' => 'Suomi',
+            'fil' => 'Filipino',
+            'fr' => 'Français',
+            'ga' => 'Gaeilge',
+            'gl' => 'Galego',
+            'gu' => 'ગુજરાતી',
+            'he' => 'עברית',
+            'hi' => 'हिन्दी',
+            'hr' => 'Hrvatski',
+            'hu' => 'Magyar',
+            'hy' => 'Հայերեն',
+            'id' => 'Bahasa Indonesia',
+            'is' => 'Íslenska',
             'it' => 'Italiano',
-            'pt' => 'Português',
-            'ru' => 'Русский',
-            'zh' => '中文',
             'ja' => '日本語',
-            'ar' => 'العربية'
+            'ka' => 'ქართული',
+            'kk' => 'Қазақша',
+            'km' => 'ខ្មែរ',
+            'ko' => '한국어',
+            'lo' => 'ລາວ',
+            'lt' => 'Lietuvių',
+            'lv' => 'Latviešu',
+            'mk' => 'Македонски',
+            'mn' => 'Монгол',
+            'mr' => 'मराठी',
+            'ms' => 'Bahasa Melayu',
+            'mt' => 'Malti',
+            'my' => 'မြန်မာ',
+            'ne' => 'नेपाली',
+            'nl' => 'Nederlands',
+            'no' => 'Norsk',
+            'pa' => 'ਪੰਜਾਬੀ',
+            'pl' => 'Polski',
+            'pt' => 'Português',
+            'ro' => 'Română',
+            'ru' => 'Русский',
+            'si' => 'සිංහල',
+            'sk' => 'Slovenčina',
+            'sl' => 'Slovenščina',
+            'sq' => 'Shqip',
+            'sr' => 'Српски',
+            'sv' => 'Svenska',
+            'sw' => 'Kiswahili',
+            'ta' => 'தமிழ்',
+            'te' => 'తెలుగు',
+            'th' => 'ไทย',
+            'tl' => 'Tagalog',
+            'tr' => 'Türkçe',
+            'uk' => 'Українська',
+            'ur' => 'اردو',
+            'uz' => 'Oʻzbek',
+            'vi' => 'Tiếng Việt',
+            'zh' => '中文',
         ];
-        
         return $names[$langCode] ?? strtoupper($langCode);
     }
     
@@ -1051,11 +1120,6 @@ class CodePressCMS {
         return $result;
     }
     
-    /**
-     * Detect user language from browser headers
-     * 
-     * @return string Language code ('nl' or 'en')
-     */
     /**
      * Generate directory listing page
      * 
@@ -1077,9 +1141,7 @@ class CodePressCMS {
             'title' => $title,
             'content' => $content
         ];
-        
-        // Debug: ensure we're returning the right title
-        
+
         if (!is_dir($dirPath)) {
             return [
                 'title' => $title,
@@ -1219,7 +1281,7 @@ class CodePressCMS {
             'lang_switch_url' => '',
             'author_name' => $this->config['author']['name'] ?? 'CodePress Developer',
             'author_website' => $this->normalizeUrl($this->config['author']['website'] ?? '') ?: '#',
-            'author_git' => 'https://git.noorlander.info/E.Noorlander',
+            'author_git' => $this->config['author']['git'] ?? '',
             'seo_description' => $this->config['seo']['description'] ?? 'CodePress CMS - Lightweight file-based content management system',
             'seo_keywords' => $this->config['seo']['keywords'] ?? 'cms, php, content management, file-based',
             'block_ai_bots' => !empty($this->config['security']['block_ai_bots']),
@@ -1496,35 +1558,6 @@ class CodePressCMS {
         };
     }
 
-    /**
-     * Determine content type for current page
-     * 
-     * @param array $page Page data
-     * @return string Content type (markdown, php, html)
-     */
-    private function getContentType($page) {
-        // Try to determine content type from page request
-        $pagePath = $_GET['page'] ?? $this->getEffectiveDefaultPage();
-        $pagePath = preg_replace('/\.[^.]+$/', '', $pagePath);
-        
-        $filePath = $this->config['content_dir'] . '/' . $pagePath;
-        
-        // Check for different file extensions
-        if (file_exists($filePath . '.md')) {
-            return 'markdown';
-        } elseif (file_exists($filePath . '.php')) {
-            return 'php';
-        } elseif (file_exists($filePath . '.html')) {
-            return 'html';
-        } elseif (file_exists($filePath)) {
-            $extension = pathinfo($filePath, PATHINFO_EXTENSION);
-            return in_array($extension, ['md', 'php', 'html']) ? $extension : 'markdown';
-        }
-        
-        // Default to markdown
-        return 'markdown';
-    }
-    
     /**
      * Auto-detect the first available content page
      *
@@ -1669,4 +1702,4 @@ class CodePressCMS {
     {
         return str_replace('-/assets/', '/-assets/', $content);
     }
-}// Guide fix: 1786349431
+}