Set default language pack for a forum

[GetGamer.com]

I'm just developing some language-specific forums, the first of which is in Spanish. I'd like to be able to set a specific language pack for that forum, so that when guests visit the forum, the vBulletin interface is in the correct language (Spanish, in this example).

Members, assuming they haven't changed their language preference in the User CP from "Use Forum Default," would also see the interface in Spanish when they visited that particular forum.

Members who have selected a specific language pack (English or Spanish) would see always see the vBulletin language pack they selected. Although I'm thinking this might work in much the same way as the forum-specific style assignment, where the admin has the option of overriding user preferences.

One final feature that would be nice would be the ability to set the language pack used in the querystring (like you can with styles). This would make it really easy to test forums in a variety of languages without jumping back and forth to the User CP.

[GetGamer.com]

BUMP! I would think that for sites that use multiple language packs, and in particular have special language-specific forums, that this Mod would be a real benefit. Anyone have any suggestions on how to tackle this?

[GetGamer.com]

Anyone? I'm still looking for a solution... or even some pointers on writing this myself.

[Andreas]

Setting a language per forum unfortunately isn't easy - without major changes on the design of vBulletin.
(Or producing overhead)

[GetGamer.com]

Why not? Seems like it wouldn't take much to do it in a manner similar to setting a theme, even using a querystring.