Hello,
What you've noticed it the fact that the xml language files for the Arab language are far from complete yet. You can find these files in the Xmldata/languages directory of the website. Currently the language files that are complete and up to date (to version Survey 1.2.2.) are the En-US and Nl-Nl (Dutch) files.
We would certainly appriciate any assistance on the translation of any of the other languages. If you want to make a contribution, please let us know and we will explain how to create the arabic files properly. It would be a great help.