Internationalization (via i18n) should be added to Python code and templates.
I can do some work on this if you'd like.
I will happily provide a german translation for some of the apps.
Also i could add some of the internationalization hooks.
I'd just fork this project and provide him with a pull request. I'd guess Nathan would be happy to add it into the project if it was up to his standards. I'll try to get my ass in gear and do some more work on the project if I can find the time...