What file is changed by GNOME if I change the language environment?

[Qingjia Zhu <qjzhutemp yahoo ie>]

>From the 'Start Here' -> System -> Language, I changed
my
  language enviroment, then I log out GNOME and logout
bash
  and relogin bash, I found the $LANG was set to
another 
value,
  I'm wondering what file was changed by GNOME to make
such
  effective take place, because I found my .bashrc and
  .bash_profile remains that same, thanks.
 

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