sp_defaultlanguage (Transact-SQL)
Applies to: 
SQL Server
Changes the default language of for a SQL Server login.
Important
This feature will be removed in a future version of SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Use ALTER LOGIN instead.
Transact-SQL syntax conventions
Syntax
sp_defaultlanguage
[ @loginame = ] N'loginame'
[ , [ @language = ] N'language' ]
[ ; ]
Arguments
[ @loginame = ] N'loginame'
The login name. @loginame is sysname, with no default. @loginame can be an existing SQL Server login, or a Windows user or group.
[ @language = ] N'language'
The default language of the login. @language is sysname, with a default of NULL. @language must be a valid language on the server. If @language isn't specified, @language is set to the server default language (defined by the default language server configuration option).
Changing the server default language doesn't change the default language for existing logins.
Return code values
0 (success) or 1 (failure).
Remarks
sp_defaultlanguage calls ALTER LOGIN, which supports extra options. For information about changing other login defaults, see ALTER LOGIN.
Use the SET LANGUAGE statement to change the language of the current session. Use the @@LANGUAGE function to show the current language setting.
If the default language of a login is dropped from the server, the login acquires the default language of the server. sp_defaultlanguage can't be executed within a user-defined transaction.
Information about languages installed on the server is visible in the sys.syslanguages catalog view.
Permissions
Requires ALTER ANY LOGIN permission.
Examples
The following example uses ALTER LOGIN to change the default language for login Fathima to Arabic. This is the preferred method.
ALTER LOGIN Fathima WITH DEFAULT_LANGUAGE = Arabic;
GO