GDM in english, installed from the LiveCD

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http://forums.fedoraforum.org – I forgot to set my language to spanish, the first time i used the LiveCD to install Fedora 12, now the GDM is in english, as the rest of the system, except my GNOME session, because i log into it in spanish. I would like to set spanish as my default language for all the system, how do i do it? (HowTos)