In this article we will discuss how change the default language in SharePoint 2010. Also you can check out my previous posts on:
Just to let you once you will finish installing language packs then you will get option to choose the default language for your SharePoint 2010 site. If you do not have language pack installed then the only language will be selected.
Once your language pack successfully installed, Click one the Select Display Language from the Top wel come menu. And according to your language packs it will show you the list of all languages to change.
Once you will select your default language then you can go to Site Actions and the Site Settings and from the Site Settings page go to the Site Administration section choose Language Settings.
In the Language Settings page you will be able to see the default language that you have selected and the optional languages.