You could root your phone, although do a little reading to know the risks.
Try settings (menu button, wrench thing), language and keyboard, (the somethingth option *someone help!*)
Yes, my phone broke lol
AFAIK theyre the same. The HD has a better screen and some better specs. Its like the Htc sensation and the sensation xe. But to be safe, I'll go check with the pros at XDA.