Add "invalid_credentials" message to multiple language files

- Updated Spanish (es.json) to include "invalid_credentials": "Credenciales no válidas"
- Updated French (fr.json) to include "invalid_credentials": "Des références non valides"
- Updated Italian (it.json) to include "invalid_credentials": "Credenziali non valide"
- Updated Korean (ko.json) to include "invalid_credentials": "잘못된 자격 증명"
- Updated Dutch (nl.json) to include "invalid_credentials": "Ongeldige referenties"
- Updated Norwegian (no.json) to include "invalid_credentials": "Ugyldig legitimasjon"
- Updated Russian (ru.json) to include "invalid_credentials": "Неверные полномочия"
- Updated Swedish (sv.json) to include "invalid_credentials": "Ogiltiga referenser"
- Updated Chinese (zh.json) to include "invalid_credentials": "无效的凭据"

frontend/src/locales/fr.json

@@ -477,7 +477,8 @@
     "disabled": "Désactivé",
     "disconnected": "Déconnecté",
     "email_management": "Gestion des e-mails",
-    "enter_last_name": "Entrez votre nom de famille"
+    "enter_last_name": "Entrez votre nom de famille",
+    "invalid_credentials": "Des références non valides"
   },
   "checklist": {
     "checklist_delete_error": "Erreur lors de la suppression de la liste de contrôle",