Not a developer? Go to



This is documentation about a configuration directive, which can be placed within Movable Type’s core configuration file, mt-config.cgi, to customize the behavior of the system.

Determines the language which will apply to the Movable Type interface when no user is logged in.

The value should be the name of a “localization module” installed on your server. Localization modules should be placed in the directory lib/MT/L10N/ within the Movable Type directory.

When a user is logged in to Movable Type, the interface will be presented in the language specified by the user’s profile settings.


Default is US English:

DefaultLanguage en_us


Other acceptable core values: de, es, fr, ja, nl


Set to German

DefaultLanguage de