Supported languages in Debian pkg?

Hi everyone :)
I've received the debconf update mail [1] for the file "mailman 1:2.1.8-3".
Although my language is now supported in both stable [2] and trunk [3] Mailman, this template does not list my language in the fairly long list of supported languages.
Does this mean that the Debian package is lagging behind current versions?
I'm a bit disappointed, because I've looked forward to my community being able to use Mailman.
from Clytie (vi-VN, Vietnamese free-software translation team / nhóm Việt hóa phần mềm tự do) http://groups-beta.google.com/group/vi-VN
These notes are for translators who may not be used to the jargon:
[1]
(a) debconf - a configuration program for the Debian free-software operating system: its files are called "debconf templates". If you package software for Debian, you also create a debconf template to configure that software for that user's Debian system.
(b) update mail - there are around 700 debconf templates, so monitoring a list of them, especially in a distributed system like Debian, is inefficient. Developers can register for these update mails, which notify the last translator when the file is updated, and send it to him/her for update. You send the updated file by reply.
[2] stable - the newest released version of Mailman for general use
[3] trunk - the newest developed version of Mailman, for testing use
participants (1)
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Clytie Siddall