sarge gdm language entry, howto add language?

[Joao Clemente <jpcl@rnl.ist.utl.pt>]

Hi.
Can someone please tell me how to add a language entry to gdm Language 
option? I have googled and saw a dscussion where it seemed that this was 
hardcoded in gdm, what does not makes sense to me..
I installed kde-i18n-pt and my guess is that I'm mising some package, 
maybe gnome related, that enables "pt" to show up in gdm language listing..
I've tried
"apt-cache search pt | grep gdm" and
"apt-cache search pt | grep gnome" but none of these show any 
interesting results...

(using sarge)
Thanks
Joao Clemente