How the Multi-Lingual User Interface Works in SharePoint 2010

The SharePoint 2010 multi-lingual user interface feature can display the site user interface in a secondary language that the user selects which is different from the primary language set when the site is created. 

To enable site user interface in secondary language follow the steps below:


Step 1: Click on the  Site Actions, under Site Actions click on Site Settings



Step 2: Under Site Administration, click on Language Settings

Step 3: Checked the secondary language that you want to be available for the site users. Then click OK.



Step 3: Verify that it works! under your name, you should now see the "Select Display Language" and the secondary languages that you enabled.

Note: When you select a secondary language, this will not change the default primary language of the site. Other users that use the site will still see the site user interface in the primary language. User interface elements such as site navigation and administrative pages will translate to the secondary language.  It does not translate content such as documents or list items content unless someone in your organization translates these contents.


Related Article:
How to Install Language Pack in SharePoint 2010