Comment # 1 on bug 918561 from Efstathios Iosifidis

Ancor, please let me know what information you want me to provide.

Here a workaround (maybe it's what you said in the previous bug).

YaST-country has primary Greek and secondary English.
Logout and before type my password, I changed the language to Greek.

Then everything changed to Greek. When I restart my netbook, it keeps it Greek.

If I change the language in English (LightDM) and keep yast2-country in Greek,
my UI is in English.

Please tell me if it's the same of what you described before.
The language files are already downloaded but they need the LightDM to change
to be enabled.

I didn't test it with GNOME though. I'll try to setup a VirtualBox to check.
Thanks for your help.