For running XULRunner applications with different locales as a minimum something like the commandline parameters for this purpose used in firefox are needed: -UILocale <locale> (Start with <locale> resources as UI Locale) -contentLocale <locale> (Start with <locale> resources as content)
The -UILocale flag should work already, and there is no such thing as a "content locale" in toolkit apps (the language pack and the region pack are one and the same).
Okay, figured it out now. -UILocale <locale> is considered an application parameter, not a XULRunner parameter, it has to come after the application ini-file to work. I tried it before the ini-file and XULRunner just returned to the prompt without doing anything. -contentLocale <locale> strangely is a parameter for toolkit applications. Take a look at mozilla/toolkit/xre/nsAppRunner.cpp. Thanks
No it's not ;-) That's old documentation taken from the suite version of nsAppRunner.cpp, and never cleaned up.