fix: add language detection from app_settings and fix activity_logs schema

- Enhanced language detection priority in email processor:
  1. Event-specific language
  2. App settings general_default_language (NEW)
  3. Email config default_language
  4. Domain-based detection
- Fixed activity_logs insertion error by using logActivity function
- Fixed 500 error on resend email endpoint
- Emails now respect language selected in settings page

backend/src/routes/adminEvents.js

@@ -578,31 +578,54 @@ router.post('/:id/resend-email', adminAuth, async (req, res) => {
       return res.status(404).json({ error: 'Event not found' });
     }
     
-    // Format dates properly for the email
+    // Get the language preference
+    let language = 'en';
+    try {
+      // First check app_settings for general_default_language
+      const langSetting = await db('app_settings')
+        .where('setting_key', 'general_default_language')
+        .first();
+      
+      if (langSetting && langSetting.setting_value) {
+        language = langSetting.setting_value;
+      }
+    } catch (err) {
+      console.warn('Could not fetch language setting:', err);
+    }
+    
+    // Format dates based on language
     const eventDate = new Date(event.event_date);
     const expiryDate = new Date(event.expires_at);
+    const dateLocale = language === 'de' ? 'de-DE' : 'en-US';
+    
+    // Prepare password text based on language
+    const passwordText = language === 'de' 
+      ? '(Aus Sicherheitsgründen nicht angezeigt)' 
+      : '(Not shown for security reasons)';
     
     // Queue the email
     await queueEmail(id, event.host_email, 'gallery_created', {
       host_name: event.host_name || event.host_email.split('@')[0],
       event_name: event.event_name,
-      event_date: eventDate.toLocaleDateString('de-DE'), // Using German date format
+      event_date: eventDate.toLocaleDateString(dateLocale),
       gallery_link: event.share_link,
-      gallery_password: '(Aus Sicherheitsgründen nicht angezeigt)', // Security: don't show password in resent emails
-      expiry_date: expiryDate.toLocaleDateString('de-DE'),
+      gallery_password: passwordText,
+      expiry_date: expiryDate.toLocaleDateString(dateLocale),
       welcome_message: event.welcome_message || '',
       eventId: id
     });
     
-    // Log the activity - wrap in try-catch to prevent failure if activity logging fails
+    // Log the activity using the proper schema
     try {
-      await db('activity_logs').insert({
-        event_id: id,
+      await logActivity('email_resent', {
+        email_type: 'gallery_created',
+        recipient: event.host_email,
         ip_address: req.ip || '0.0.0.0',
-        user_agent: req.get('user-agent') || 'Unknown',
-        action_type: 'email_resent',
-        action_details: JSON.stringify({ email_type: 'gallery_created' }),
-        timestamp: new Date()
+        user_agent: req.get('user-agent') || 'Unknown'
+      }, id, {
+        type: 'admin',
+        id: req.admin.id,
+        name: req.admin.username
       });
     } catch (logError) {
       console.error('Warning: Failed to log activity:', logError);