Why LANG variable doesn't change the language?

[Yuri]

Boris Samorodov wrote:
> Please show an output for:
> % pkg_info -Ix firefox
>   

firefox-3.5.5,1     Web browser based on the browser portion of Mozilla
firefox3-i18n-3.0.15 Localized interface for Firefox3

> It works at FreeBSD. It's a firefox question either use it or not.
>   

On Ubuntu language of the same version of firefox is being triggered by 
LANG variable ok. This is strange.

Yuri