fix: resolve multiple issues from GitHub issue #14

- Fixed duplicate German translation for 'downloadSelected' button
- Added client_max_body_size configuration in nginx for file uploads
- Fixed date parsing in FeedbackModerationPanel to handle timestamps
- Fixed admin authentication context (req.admin vs req.user) in feedback routes
- Enhanced clipboard functionality with fallback for non-HTTPS contexts
- Fixed authentication token handling for numeric event IDs in uploads

These changes ensure comment moderation works properly, file uploads are configured correctly, and the UI handles all edge cases properly.

Fixes #14

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/config/api.ts

@@ -48,10 +48,25 @@ api.interceptors.request.use(
       const galleryMatch = config.url?.match(/gallery\/([^\/]+)/);
       
       if (galleryMatch && galleryMatch[1]) {
-        const gallerySlug = galleryMatch[1];
+        const galleryIdOrSlug = galleryMatch[1];
         // Remove any query parameters from the slug
-        const cleanSlug = gallerySlug.split('?')[0];
-        const token = localStorage.getItem(`gallery_token_${cleanSlug}`);
+        const cleanIdOrSlug = galleryIdOrSlug.split('?')[0];
+        
+        // Check if it's a numeric ID (for upload endpoints)
+        let token = null;
+        if (/^\d+$/.test(cleanIdOrSlug)) {
+          // It's an event ID - try to find the token from current page slug
+          const pathParts = window.location.pathname.split('/');
+          if (pathParts[1] === 'gallery' && pathParts[2]) {
+            const gallerySlug = pathParts[2];
+            const cleanSlug = gallerySlug.split('?')[0];
+            token = localStorage.getItem(`gallery_token_${cleanSlug}`);
+          }
+        } else {
+          // It's a slug - use it directly
+          token = localStorage.getItem(`gallery_token_${cleanIdOrSlug}`);
+        }
+        
         if (token) {
           if (!config.headers) {
             config.headers = {};