Return textual error for permissions

front/app/src/app/layout/auth/auth.interceptor.ts

@@ -26,6 +26,10 @@ export class AuthInterceptor implements HttpInterceptor {
             catchError((error: HttpErrorResponse) => {
                 if (error.status && error.status == 401) {
                     this.auth.requestAuth();
+                    return throwError(() => $localize`Authentication required`);
+                }
+                if (error.status && error.status == 403) {
+                    return throwError(() => $localize`Permissions too low`);
                 }
                 return throwError(() => error);
              })