The translation was written by a native-Japanese friend who was born, raised, and currently lives in Japan. (I'm sure he'll see the feedback here.) If you've got more specific feedback on the translation or copywriting, I'm sure he would appreciate it and it would help our efforts.
We'll have a direct support line in Japan soon. In the meantime if a Japanese-speaker did call the number we've got listed, we should be able to solve any problem or answer any question they have the same way we would for our English-speaking customers.
I'll take your advice about coming over there. :) I'd love a chance to meet more developers over there. I actually just missed a chance to come back over recently to visit one of our consulting clients in Yokohama because the meeting was too soon after my daughter's birth. Let me know if you can think of any events in particular that would be good to attend.
To your point about PR, though: Publishing the site in Japanese (even as a work in progress) is a part of our efforts to do PR in Japan. Launching the site enabled us to get coverage on Penn-Olson (http://www.penn-olson.com/2011/10/20/limelight/) which I'm hoping will help lead to some Japanese-language coverage as well.
Again, thanks so much for the time you took to provide the feedback!