update

Hello I have tryed several times to upgrade but I gets the following error: Une erreur HTTP AJAX s'est produite. Code de statut HTTP : 200 Informations de débogage ci-dessous. Chemin : http://127.0.0.1/opigno/update.php?op=selection&token=HtfRqCc2bA0IyCSd_… StatusText: OK ResponseText : Fatal error: Call to undefined function locale_string_is_safe() in /var/www/html/opigno/profiles/opigno_lms/modules/contrib/l10n_update/includes/locale/PoDatabaseWriter.php on line 246 does anyone understand this message and have a solution? Best regards,