Set different language/locale to certain app on Mac

Just because my Mac default language is Japanese does not mean I like all apps to be Japanese language, especially when it is incomplete or roughly translated one. An example is Gramps.

This is how to set the language/locale to English:

$ defaults write -app Gramps AppleLanguages "(en, jp)"
$ defaults write -app Gramps AppleLocale "en_US"
$ defaults write -app Gramps AppleCollationOrder "en"

Voila, now the ugly Japanese interface is gone for the app.