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/services/recaptcha.js

@@ -0,0 +1,58 @@
+const axios = require('axios');
+const { db } = require('../database/db');
+
+async function verifyRecaptcha(token) {
+  // Check if reCAPTCHA is enabled
+  const settings = await db('app_settings')
+    .whereIn('setting_key', ['security_enable_recaptcha', 'security_recaptcha_secret_key'])
+    .select('setting_key', 'setting_value');
+  
+  const settingsMap = {};
+  settings.forEach(setting => {
+    try {
+      settingsMap[setting.setting_key] = JSON.parse(setting.setting_value);
+    } catch (e) {
+      settingsMap[setting.setting_key] = setting.setting_value;
+    }
+  });
+  
+  const isEnabled = settingsMap.security_enable_recaptcha === true || 
+                    settingsMap.security_enable_recaptcha === 'true';
+  const secretKey = settingsMap.security_recaptcha_secret_key;
+  
+  // If reCAPTCHA is not enabled, always return true
+  if (!isEnabled) {
+    return true;
+  }
+  
+  // If enabled but no token provided, fail
+  if (!token) {
+    return false;
+  }
+  
+  // If no secret key configured, log warning but pass
+  if (!secretKey) {
+    console.warn('reCAPTCHA enabled but no secret key configured');
+    return true;
+  }
+  
+  try {
+    const response = await axios.post(
+      'https://www.google.com/recaptcha/api/siteverify',
+      null,
+      {
+        params: {
+          secret: secretKey,
+          response: token
+        }
+      }
+    );
+    
+    return response.data.success === true;
+  } catch (error) {
+    console.error('reCAPTCHA verification error:', error);
+    return false;
+  }
+}
+
+module.exports = { verifyRecaptcha };