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/adminAuth.js

@@ -1,8 +1,9 @@
 const express = require('express');
 const bcrypt = require('bcrypt');
 const { body, validationResult } = require('express-validator');
-const { db } = require('../database/db');
+const { db, logActivity } = require('../database/db');
 const { adminAuth } = require('../middleware/auth');
+const { endSession } = require('../middleware/sessionTimeout');
 const router = express.Router();
 
 // Change password
@@ -18,7 +19,7 @@ router.post('/change-password', [
     }
 
     const { currentPassword, newPassword } = req.body;
-    const userId = req.user.id;
+    const userId = req.admin.id; // Changed from req.user.id to req.admin.id
 
     // Get user from database
     const user = await db('admin_users')
@@ -46,6 +47,13 @@ router.post('/change-password', [
         updated_at: new Date()
       });
 
+    // Log activity
+    await logActivity('password_changed', 
+      { admin_id: userId }, 
+      null,
+      { type: 'admin', id: userId, name: user.username }
+    );
+
     res.json({ message: 'Password changed successfully' });
   } catch (error) {
     console.error('Password change error:', error);
@@ -53,4 +61,28 @@ router.post('/change-password', [
   }
 });
 
+// Logout
+router.post('/logout', adminAuth, async (req, res) => {
+  try {
+    // Get token from header
+    const token = req.headers.authorization?.split(' ')[1];
+    if (token) {
+      // End the session
+      endSession(token);
+    }
+    
+    // Log activity
+    await logActivity('admin_logout', 
+      { admin_id: req.admin.id }, 
+      null,
+      { type: 'admin', id: req.admin.id, name: req.admin.username }
+    );
+    
+    res.json({ message: 'Logged out successfully' });
+  } catch (error) {
+    console.error('Logout error:', error);
+    res.status(500).json({ error: 'Failed to logout' });
+  }
+});
+
 module.exports = router;