Well I'm assuming that every possible language has to be tested to ensure that it doesn't conflict...and some languages read from right to left, and some others use more characters than others, so they gotta implement and test it so it doesn't cause crashes, I suppose.
I'm using build 7100 and it's currently crashing a lot after "waking up" from sleeping for a long period of time. The thing also doesn't sleep very well, the screen will come on and it will pop up to the login screen every half hour or so, though its very random. Itunes also crashes now after waking up. I hope this is either an "only me" thing or they have fixed it.