fix: implement 9 production enhancements and security fixes

- Password Complexity: Added 4-level complexity selector (Simple/Moderate/Strong/Very Strong) in admin security settings with dynamic backend validation
- Gallery Security: Removed event date from login page (security risk), replaced with event type badge
- Analytics Config: Fixed "Not Configured" detection logic to check both admin settings and env variables
- Analytics Accuracy: Aligned calculation logic between dashboard and analytics endpoints, added totals verification
- Translations: Added missing activity keys (analytics_settings_updated, cms_page_updated, security_settings_updated, password_reset, admin_logout, system_activity)
- UI Fixes: Fixed German text overflow in CMS page selector with proper CSS truncation
- Date Format: Event creation now respects admin-configured date format instead of browser locale
- Chrome Compatibility: Replaced emoji flags with SVG components for Windows Chrome support

All changes maintain backward compatibility and production stability.

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

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

frontend/src/pages/admin/CMSPageEnhanced.tsx

@@ -153,13 +153,13 @@ export const CMSPageEnhanced: React.FC = () => {
                       : 'bg-white border border-neutral-200 hover:bg-neutral-50'
                   }`}
                 >
-                  <FileText className="w-5 h-5" />
-                  <div className="flex-1">
-                    <p className="font-medium">{t(`legal.${page.slug}`)}</p>
+                  <FileText className="w-5 h-5 flex-shrink-0" />
+                  <div className="flex-1 min-w-0">
+                    <p className="font-medium truncate">{t(`legal.${page.slug}`)}</p>
                     <p className="text-sm text-neutral-500">/{page.slug}</p>
                   </div>
                   {selectedPage === page.slug && hasUnsavedChanges && (
-                    <div className="w-2 h-2 bg-yellow-500 rounded-full" />
+                    <div className="w-2 h-2 bg-yellow-500 rounded-full flex-shrink-0" />
                   )}
                 </button>
               ))}
@@ -235,7 +235,7 @@ export const CMSPageEnhanced: React.FC = () => {
                       : 'bg-neutral-100 text-neutral-700 hover:bg-neutral-200'
                   }`}
                 >
-                  🇬🇧 English
+                  English
                 </button>
                 <button
                   onClick={() => setEditingLang('de')}
@@ -245,7 +245,7 @@ export const CMSPageEnhanced: React.FC = () => {
                       : 'bg-neutral-100 text-neutral-700 hover:bg-neutral-200'
                   }`}
                 >
-                  🇩🇪 Deutsch
+                  Deutsch
                 </button>
               </div>
             </div>