Arabic translation error

There is a bug with arabic translation. When i select the "ar" it translates perfectly to arabic, including changes with the writings from right to left but when i click again on any other languages for ex. english "en" (with arabic text waiting to be translated) i get the new language again from left to right but without translation, only writing the same arabic words but in english letters.

I tried to translate to chinese first then arabic then to any other language and it works perfectly well.

Why this happens ONLY when you first try to translate to arabic?

Any help?

Btw, i had to update line 10 in the jquery.translatablecomments.js to be able to get more languages:

var languages = ["it", "ja", "nl", "pt", "fr", "de", "ar", "ru", "zh-TW", "es", "en"];

You can get more info from Google