Fix brand theme application and add comprehensive translations

- Fixed theme not being reflected on gallery and admin login pages
- Created GlobalThemeProvider to apply themes globally
- Updated gallery and admin login pages to use dynamic CSS variables
- Added complete translations for all admin sections in English and German:
  - Notifications management
  - Event view and creation
  - Photo upload functionality
  - Category management
  - Archive page view
  - Analytics dashboard
  - Branding and theme settings
  - System settings
  - CMS page management
  - Email configuration
- Fixed admin photo management display issues
- Fixed photo upload category assignment
- Added password reset functionality for galleries
- Improved error handling and user feedback

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

backend/src/routes/publicSettings.js

@@ -5,9 +5,9 @@ const router = express.Router();
 // Get public settings (branding and theme)
 router.get('/', async (req, res) => {
   try {
-    // Fetch branding, theme, and general settings
+    // Fetch branding, theme, general, and select security settings
     const settings = await db('app_settings')
-      .whereIn('setting_type', ['branding', 'theme', 'general'])
+      .whereIn('setting_type', ['branding', 'theme', 'general', 'security'])
       .select('setting_key', 'setting_value');
     
     // Convert to object format
@@ -37,7 +37,11 @@ router.get('/', async (req, res) => {
       branding_favicon_url: settingsObject.branding_favicon_url || '',
       branding_logo_url: settingsObject.branding_logo_url || '',
       theme_config: settingsObject.theme_config || null,
-      default_language: settingsObject.general_default_language || 'en'
+      default_language: settingsObject.general_default_language || 'en',
+      enable_analytics: settingsObject.general_enable_analytics !== false,
+      enable_recaptcha: settingsObject.security_enable_recaptcha === true || settingsObject.security_enable_recaptcha === 'true',
+      recaptcha_site_key: settingsObject.security_recaptcha_site_key || null,
+      maintenance_mode: settingsObject.general_maintenance_mode === true || settingsObject.general_maintenance_mode === 'true'
     };
 
     res.json(publicSettings);