The latest release can optionally be translated into any of the 64 languages supported by Google Translate. The home page (and associated static web pages) can also be translated (look for ‘Select Language’ menu underneath the side bar navigation area). The home page has links to both the untranslated English version and the version that is capable of translation. You can also reload your current model in another language by clicking the ‘Other languages’ tab in the Behaviour Composer.
Google translate does a surprisingly good job but there are mistakes. (We’ve already fixed a few in German and Portuguese.) You can help by hovering over a translation and clicking on the ‘Contribute a better translation’ button.