I answered your first one in another post you made
As far as the second one there is no solution that I know of. We don't support Arabic and I personally do not know how it is handled through mysql so most likely those arabic letters are being stored in mysql as something different which would be why they can not login.
omegatron, I asked qs there and no answer it till now, I think this related to change the encoding for some files from ِAnsi to Unicode or utf-8 to support this language, im not expert in this thing and I don't know where to change this but maybe this will fix the problem.
I did indeed answer your post on registered users I think you placed it in the classifieds area though.
As far as the Arabic stuff this is a support forum. This is for the normal work of the program Our program is not written in Arabic and does not support Arabic. As I stated I do no know how those character's are being written into the mysql database so one does not know what the issue is.
As far as encoding I think your far ahead of yourself here. First you need to write an Arabic translation. Then you also need to load the proper encoding.