diff --git a/backend/core/views.py b/backend/core/views.py
index 0e781ea0b..2fcffb3fa 100644
--- a/backend/core/views.py
+++ b/backend/core/views.py
@@ -843,7 +843,7 @@ def update(self, request: Request, *args, **kwargs) -> Response:
             if number_of_admin_users == 1 :
                 new_user_groups = set(request.data["user_groups"])
                 if str(admin_group.pk) not in new_user_groups :
-                    return Response({"error":"You can't remove the admin user group from the only admin user of the application."},status=HTTP_403_FORBIDDEN)
+                    return Response({"error":"attemptToRemoveOnlyAdminUserGroup"},status=HTTP_403_FORBIDDEN)
 
         return super().update(request, *args, **kwargs)
 
@@ -852,7 +852,7 @@ def destroy(self, request, *args, **kwargs):
         if user.is_admin() :
             number_of_admin_users = User.get_admin_users().count()
             if number_of_admin_users == 1 :
-                return Response({"error":"You can't delete the only admin account of your application."},status=HTTP_403_FORBIDDEN)
+                return Response({"error":"attemptToDeleteOnlyAdminAccountError"},status=HTTP_403_FORBIDDEN)
 
         return super().destroy(request,*args,**kwargs)
 
diff --git a/frontend/messages/en.json b/frontend/messages/en.json
index 9ee365bf1..8e1cb7b6b 100644
--- a/frontend/messages/en.json
+++ b/frontend/messages/en.json
@@ -491,5 +491,7 @@
 	"libraryAlreadyImportedError": "This library has already been imported.",
 	"invalidLibraryFileError": "Invalid library file. Please make sure the format is correct.",
 	"taintedFormMessage": "Do you want to leave this page? Changes you made may not be saved.",
-	"riskScenariosStatus": "Risk scenarios status"
+	"riskScenariosStatus": "Risk scenarios status",
+	"attemptToDeleteOnlyAdminAccountError": "You can't delete the only admin account of your application.",
+	"attemptToRemoveOnlyAdminUserGroup": "You can't remove the only admin user of the application from the admin user group."
 }
diff --git a/frontend/messages/fr.json b/frontend/messages/fr.json
index 030a726db..775e010a0 100644
--- a/frontend/messages/fr.json
+++ b/frontend/messages/fr.json
@@ -491,5 +491,7 @@
 	"libraryAlreadyImportedError": "Cette libairie a été déjà été importée.",
 	"invalidLibraryFileError": "Fichier de bibliothèque invalide. Veuillez vérifier le format du fichier.",
 	"taintedFormMessage": "Voulez-vous vraiment quitter cette page ? Toutes les données non enregistrées seront perdues.",
-	"riskScenariosStatus": "Statut des scénarios de risque"
+	"riskScenariosStatus": "Statut des scénarios de risque",
+	"attemptToDeleteOnlyAdminAccountError": "Vous ne pouvez pas supprimer votre unique compte administrateur de l'application.",
+	"attemptToRemoveOnlyAdminUserGroup": "Vous ne pouvez pas retirer le seul compte administrateur de l'application du groupe des administrateurs."
 }
diff --git a/frontend/src/lib/utils/locales.ts b/frontend/src/lib/utils/locales.ts
index 44e8e03c5..86724080d 100644
--- a/frontend/src/lib/utils/locales.ts
+++ b/frontend/src/lib/utils/locales.ts
@@ -309,7 +309,9 @@ export function localItems(languageTag: string): LocalItems {
 		highSOK: m.highSOK({ languageTag: languageTag }),
 		libraryImportError: m.libraryImportError({ languageTag: languageTag }),
 		libraryAlreadyExistsError: m.libraryAlreadyImportedError({ languageTag: languageTag }),
-		invalidLibraryFileError: m.invalidLibraryFileError({ languageTag: languageTag })
+		invalidLibraryFileError: m.invalidLibraryFileError({ languageTag: languageTag }),
+		attemptToDeleteOnlyAdminAccountError: m.attemptToDeleteOnlyAdminAccountError({ languageTag: languageTag }),
+		attemptToRemoveOnlyAdminUserGroup: m.attemptToRemoveOnlyAdminUserGroup({ languageTag: languageTag })
 	};
 	return LOCAL_ITEMS;
 }
diff --git a/frontend/src/routes/(app)/[model=urlmodel]/+page.server.ts b/frontend/src/routes/(app)/[model=urlmodel]/+page.server.ts
index 5d5c227ab..e3d947766 100644
--- a/frontend/src/routes/(app)/[model=urlmodel]/+page.server.ts
+++ b/frontend/src/routes/(app)/[model=urlmodel]/+page.server.ts
@@ -156,7 +156,7 @@ export const actions: Actions = {
 				const response = await res.json();
 				console.log(response);
 				if (response.error) {
-					setFlash({ type: 'error', message: response.error }, event);
+					setFlash({ type: 'error', message: localItems(languageTag())[response.error] }, event);
 					return fail(403, { form: deleteForm });
 				}
 				if (response.non_field_errors) {
diff --git a/frontend/src/routes/(app)/users/[id=uuid]/edit/+page.server.ts b/frontend/src/routes/(app)/users/[id=uuid]/edit/+page.server.ts
index efd879bc2..3578753eb 100644
--- a/frontend/src/routes/(app)/users/[id=uuid]/edit/+page.server.ts
+++ b/frontend/src/routes/(app)/users/[id=uuid]/edit/+page.server.ts
@@ -6,6 +6,8 @@ import { redirect, fail, type Actions } from '@sveltejs/kit';
 import { getModelInfo } from '$lib/utils/crud';
 import { setFlash } from 'sveltekit-flash-message/server';
 import * as m from '$paraglide/messages';
+import { languageTag } from '$paraglide/runtime';
+import { localItems } from '$lib/utils/locales';
 
 export const load: PageServerLoad = async ({ params, fetch }) => {
 	const URLModel = 'users';
@@ -58,7 +60,7 @@ export const actions: Actions = {
 			const response = await res.json();
 			console.error('server response:', response);
 			if (response.error) {
-				setFlash({ type: 'error', message: response.error }, event);
+				setFlash({ type: 'error', message: localItems(languageTag())[response.error] }, event);
 				return fail(403, { form: form });
 			}
 			if (response.non_field_errors) {