Right now there is very limited support for text entry in different scripts on the Storm. I know there is entry/read in Arabic. Read only for Hebrew. I previously posted a couple of links for programs facilitating read and text entry. Below is another link to an app that might help you. I do know that Asian scripts require a firmware update and other tweaks to the phone that are a bit complicated. But Google around because people are always creating text entry apps for the Blackberry.
InterType for BlackBerry - type in Russian, Bulgarian, Greek, Turkish and more on your BlackBerry phone