[Cooker] Change system language

[Jose Jorge]

I've been searching for a while how to change a One installed system to 
get the boot screens localized. It is important as it puzzles end users 
to get something english in their system.

- I tried to change root user language changed, without success.
- The file /etc/sysconfig/i18n is correctly setted.

I just can't find where is the difference between a standard install and 
One for this setting.

Any idea?