To get the arabic language:
1. In the registry setting of your Developer Suite installed and modify the value of "NLS_LANG" = "AMERICAN_AMERICA.AR8MSWIN1256"
2.Create one more Environment Variable in System Properties named "NLS_LANG" with value "AMERICAN_AMERICA.AR8MSWIN1256"
then restart the system and check again.
Hope it will work for you.