I can't attest to the 9800 but if you download the new desktop manager, in the applications section you can see all the languages supported, which for me (9650) includes a slew of languages, arabic and hebrew included, for input and and reading compatbility. Hope that helps!
You can add arabic keyboard and arabic input using the official firmware easly:
1) Install CrackUtil.
2) Download attached folder.
3) Open CrackUtil > File Manipulation
3) Click on: Load File to Device
4) Upload the 3 files one by one (each time the device will reboot)