Quoting pkg-mailman-hackers@lists.alioth.debian.org:
Hi, We recently requested updates for the mailman debconf translations; however, shortly after our call, upstream added a handful more languages that they support and thus there's more choices to translate.Please consider updating your translation; unfortunately we've got little timeleft for etch but any update is welcome.
Hola, Yo no voy a poder actualizarla por falta de tiempo. Si alguien se anima... Un saludo, Carlos.