After install: "authorise my app" from the Setting tabbed view.
Usage suggestion: try a search and you'll be able to immediately translate a Japanese tweet to "ru" (Russian) or to "en" (English) , "it" (Italian), etc...
Finally save the tweets (from searches, home, mentions or lists) to your Google Drive as a .txt file :-)
Swipe right a tweet's text to see the reply/translate buttons.
It is an open source project.
The app has been ported to the "new" Twitter integration layer (Twitter discontinued the old APIs):
Tabbed view for status update (a.k.a. twitting) and authomatic callback settings.
Tweet search is plain Json, while Oauth is implemented via Signpost