Manual:$wgUseDatabaseMessages/fr

Détails
Ce paramètre indique si l'espace de noms MediaWiki est utilisé pour modifier les fichiers de langue. If, then the wiki's interface is editable by those with   privileges; if  , then the wiki's interface is determined directly from the internationalized message file specified in.

Setting this variable to true will cause all interface messages to be retrieved from the database, which will increase load times by 25-60% (unless memcached is installed, in which case messages will be retrieved from the cache, which is a lot quicker). Pour des raisons de performance, il est recommandé de désactiver de paramètre si vous n'avez pas memcached.