Would you love a HTC Touch Diamond, but afraid it wont work in your language? Never fear, Panosha from XDA-Developers have the solution.
Simply change the value in this registry key HKEY_CURRENT_USER\MUI\CurLang from Hex 409 (english) to any other localization value (found in this list ). 408 is Greek, 404 is traditional Chinese, 40E is Hungarian and so on.
Tip via XDA-Developers.com