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 <[email protected]>

frontend/src/pages/GalleryPage.tsx

@@ -1,6 +1,6 @@
 import React, { useState } from 'react';
 import { useParams, Link } from 'react-router-dom';
-import { Calendar, AlertCircle, Clock } from 'lucide-react';
+import { AlertCircle, Clock } from 'lucide-react';
 import { differenceInDays, parseISO } from 'date-fns';
 import { useTranslation } from 'react-i18next';
 import { useLocalizedDate } from '../hooks/useLocalizedDate';
@@ -292,10 +292,15 @@ export const GalleryPage: React.FC = () => {
             <h1 className="text-xl sm:text-2xl lg:text-3xl font-bold mb-2 px-2" style={{ color: 'var(--color-text, #171717)' }}>
               {galleryInfo?.event_name}
             </h1>
-            <div className="flex items-center justify-center text-xs sm:text-sm" style={{ color: 'var(--color-text, #171717)', opacity: 0.7 }}>
-              <Calendar className="w-3 h-3 sm:w-4 sm:h-4 mr-1" />
-              <span className="truncate">{format(parseISO(galleryInfo!.event_date), 'PP')}</span>
-            </div>
+            {galleryInfo?.event_type && (
+              <div className="flex items-center justify-center text-xs sm:text-sm" style={{ color: 'var(--color-text, #171717)', opacity: 0.7 }}>
+                <span className="px-3 py-1 rounded-full" style={{ backgroundColor: 'var(--color-primary, #5C8762)', opacity: 0.1 }}>
+                  <span style={{ color: 'var(--color-primary, #5C8762)' }}>
+                    {t(`events.types.${galleryInfo.event_type}`)}
+                  </span>
+                </span>
+              </div>
+            )}
           </div>
 
           {/* Expiration Warning */}