feat: add translation for unauthorized error

Author: Adrien

src/main/resources/i18n/en.json

@@ -4,5 +4,6 @@
   "error.attribute.unknown": "Unknown attribute '{attribute}' for entity '{entity}'",
   "error.entity.attributes": "Validation errors occurred for entity: {entity}",
   "error.provider.unknown": "Unknown provider '{provider}' for entity '{entity}'",
-  "error.plugin.unknown": "Unknown plugin: {type}"
-}
+  "error.plugin.unknown": "Unknown plugin: {type}",
+  "error.authentication.unauthorized": "Unauthorized"
+}

src/main/resources/i18n/fr.json

@@ -4,5 +4,6 @@
   "error.attribute.unknown": "Attribut inconnu '{attribute}' pour l'entité '{entity}'",
   "error.entity.attributes": "Erreurs de validation pour l'entité: {entity}",
   "error.provider.unknown": "Provider inconnu '{provider}' pour l'entité '{entity}'",
-  "error.plugin.unknown": "Plugin inconnu: {type}"
-}
+  "error.plugin.unknown": "Plugin inconnu: {type}",
+  "error.authentication.unauthorized": "Non autorisé"
+}