fix: email resend language and password display issues

- Added missing translation for admin.activities.email_resent in both EN and DE
- Fixed language detection in resend email to use email processor's priority system
- Fixed password security message showing German text in English emails
- Updated email processor to handle password placeholder and format dates properly
- Dates are now formatted according to language and system settings
- Password security message now displays in the correct language based on recipient

frontend/src/i18n/locales/de.json

@@ -715,6 +715,7 @@
       "settings_updated": "Einstellungen aktualisiert",
       "event_updated": "Veranstaltung aktualisiert: {{eventName}}",
       "event_deleted": "Veranstaltung gelöscht: {{eventName}}",
+      "email_resent": "Erstellungs-E-Mail erneut gesendet für: {{eventName}}",
       "category_created": "Kategorie erstellt: {{categoryName}}",
       "category_updated": "Kategorie aktualisiert: {{categoryName}}",
       "category_deleted": "Kategorie gelöscht: {{categoryName}}",

frontend/src/i18n/locales/en.json

@@ -766,6 +766,7 @@
       "settings_updated": "Settings updated",
       "event_updated": "Event updated: {{eventName}}",
       "event_deleted": "Event deleted: {{eventName}}",
+      "email_resent": "Creation email resent for: {{eventName}}",
       "category_created": "Category created: {{categoryName}}",
       "category_updated": "Category updated: {{categoryName}}",
       "category_deleted": "Category deleted: {{categoryName}}",