voir https://git.spip.net/spip-galaxie/univers_spip/src/commit/eaf4b20865467402b880fc892a1b473c86636cf3/inc/univers.php#L270 et https://git.spip.net/spip-galaxie/univers_spip/src/commit/eaf4b20865467402b880fc892a1b473c86636cf3/inc/univers.php#L274