8.7.1 Custom Language Definition
The language code pairs used to generate the MSI and MSP file names are mapped in <sysdir>\X_Apps\X_Wix\Content\Languages.xml
To support additional languages modify the Languages.xml file by adding an entry for the required language in the format:
<Language Id="WXYZ" Culture="wx-yz" Locale="2052" CodePage="950"/>
In addition you will need to define an appropriate WIX localization file in …\X_Apps\X_Wix\Source, for example, file wx-yz.wxl.