I collaborate the translation of the Responsive Theme. In the next update there will be 39 languages but now there are only a few less.
I started your great plugin and I saw that it said that there are only 28 langues. After looking for Arabic I saw that you didn't include it in your list.
Then I realized that it is a problem that I also had that from some language like Arabic the language code is without the country "ar" . You can find the whole list here.
P.s. Could you also a the settings link the plugin page? Here is how! :)