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 <[email protected]>

backend/src/routes/auth.js

@@ -3,6 +3,7 @@ const bcrypt = require('bcrypt');
 const jwt = require('jsonwebtoken');
 const { body, validationResult } = require('express-validator');
 const { db } = require('../database/db');
+const { verifyRecaptcha } = require('../services/recaptcha');
 const router = express.Router();
 
 // Admin login
@@ -16,7 +17,13 @@ router.post('/admin/login', [
       return res.status(400).json({ errors: errors.array() });
     }
     
-    const { username, password } = req.body;
+    const { username, password, recaptchaToken } = req.body;
+    
+    // Verify reCAPTCHA
+    const recaptchaValid = await verifyRecaptcha(recaptchaToken);
+    if (!recaptchaValid) {
+      return res.status(400).json({ error: 'reCAPTCHA verification failed' });
+    }
     
     const admin = await db('admin_users')
       .where({ username })
@@ -60,9 +67,15 @@ router.post('/gallery/verify', [
       return res.status(400).json({ errors: errors.array() });
     }
     
-    const { slug, password } = req.body;
+    const { slug, password, recaptchaToken } = req.body;
     
-    const event = await db('events').where({ slug, is_active: true }).first();
+    // Verify reCAPTCHA
+    const recaptchaValid = await verifyRecaptcha(recaptchaToken);
+    if (!recaptchaValid) {
+      return res.status(400).json({ error: 'reCAPTCHA verification failed' });
+    }
+    
+    const event = await db('events').where({ slug, is_active: true, is_archived: false }).first();
     if (!event) {
       return res.status(404).json({ error: 'Gallery not found or expired' });
     }