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]>

frontend/src/services/auth.service.ts

@@ -3,11 +3,12 @@ import type { LoginResponse, GalleryAuthResponse } from '../types';
 
 export const authService = {
   // Admin authentication
-  async adminLogin(credentials: { email: string; password: string }): Promise<LoginResponse> {
+  async adminLogin(credentials: { email: string; password: string; recaptchaToken?: string | null }): Promise<LoginResponse> {
     // Backend expects 'username' field, but we accept email
     const response = await api.post<LoginResponse>('/api/auth/admin/login', {
       username: credentials.email,
-      password: credentials.password
+      password: credentials.password,
+      recaptchaToken: credentials.recaptchaToken
     });
     
     setAuthToken(response.data.token, true);
@@ -20,10 +21,11 @@ export const authService = {
   },
 
   // Gallery authentication
-  async verifyGalleryPassword(slug: string, password: string): Promise<GalleryAuthResponse> {
+  async verifyGalleryPassword(slug: string, password: string, recaptchaToken?: string | null): Promise<GalleryAuthResponse> {
     const response = await api.post<GalleryAuthResponse>('/api/auth/gallery/verify', {
       slug,
       password,
+      recaptchaToken
     });
     
     setAuthToken(response.data.token, false);