after creating a site you can go to:
Site Actions / Site Settings / Site Administration / Language Settings
and select some alternate language(s) if you've got some language pack(s) installed, but the default one is fix and you can't cange it anymore. Is there a way or some settings.file where you can change the default language?
OK, It's me again answering my own question(s)...
It works so good this sql_way! After searching around for so long time I've finally found this soluion! done in a few seconds!
george
来源：https://stackoverflow.com/questions/3599492/how-can-i-change-a-sites-default-language-after-creation-sharepoint-2010