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/utils/passwordGenerator.js

@@ -0,0 +1,39 @@
+/**
+ * Generate a secure random password
+ * @param {number} length - Password length (default 12)
+ * @returns {string} Generated password
+ */
+function generatePassword(length = 12) {
+  const lowercase = 'abcdefghijklmnopqrstuvwxyz';
+  const uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+  const numbers = '0123456789';
+  const symbols = '!@#$%&*';
+  
+  // Ensure at least one character from each set
+  const requiredChars = [
+    lowercase[Math.floor(Math.random() * lowercase.length)],
+    uppercase[Math.floor(Math.random() * uppercase.length)],
+    numbers[Math.floor(Math.random() * numbers.length)],
+    symbols[Math.floor(Math.random() * symbols.length)]
+  ];
+  
+  // Fill the rest with random characters from all sets
+  const allChars = lowercase + uppercase + numbers + symbols;
+  const remainingLength = length - requiredChars.length;
+  
+  let password = '';
+  for (let i = 0; i < remainingLength; i++) {
+    password += allChars[Math.floor(Math.random() * allChars.length)];
+  }
+  
+  // Combine and shuffle
+  const passwordArray = [...requiredChars, ...password];
+  for (let i = passwordArray.length - 1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i + 1));
+    [passwordArray[i], passwordArray[j]] = [passwordArray[j], passwordArray[i]];
+  }
+  
+  return passwordArray.join('');
+}
+
+module.exports = { generatePassword };