The site Default Language sets the language to use if a regional language is unavailable.
In order to access to such a management area, when logged in as an administrator, select the option “Site Settings” in the menu or click the icon 
. Click Advanced Settings and Other Settings.
In Default Language, select the desired language and click Update.
Article ID: 2233, Created: September 9, 2009 at 3:38 PM, Modified: November 18, 2009 at 12:38 PM