To specify which language configuration template to use for your DITA2Go project, in your project configuration file:
[Templates] ; Languages = path to language-specific .ini file Languages = %OMSYSHOME%\d2g\local\lang\local_d2g_lang_en.ini
DITA2Go checks the referenced language template whenever a text setting does not appear in your project configuration file or in a document-specific configuration file.
The default language is English, and the default language template is d2g_lang_en.ini. To use a different language, reference one of the other language configuration files in \d2g\local\lang, or insert a language configuration file of your own in the template chain. See §39.1.6 Understanding how language templates are organized.