I know OSX 10.10 Yosemite is in Developer Preview state.
Nevertheless I got 2 programs, one is Doit.IM, which show me the whole interface in japanese or chinese characters. I don't understand any of them so I cannot tell exactly.

I think it has something to do with the changes made in Yosemite. As even DP2 didn't fix the issue I suppose that it's something Apple changed for Yosemite.

I'd like to help you test the program under the new Platform, but I cannot understand a word. Could you go into this and perhaps mail me some kind of test-version if you don't have the Yosemite DP?