You can run setlang.exe from the command line to launch the Office Language
Settings tool, which can be used to manage language settings.
There are no command line arguments for setlang.exe. If you want to modify
a user's language settings programmatically, then the best approach is to
change the registry values in
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Common\LanguageResources.
Most of the values in the LanguageResources key use LCIDs. English(U.S.) =
1033, Japanese = 1041, etc. The language-to-lcid mapping is available on
http://www.microsoft.com/globaldev/reference/lcid-all.mspx .