It seems that the official download website is only in English language. If you want to read it in Arabic language, you can use the iTools from Google in order to translate it to whatever language you want. To use the online tool, you just need to copy the URL of the Adobe page in the special section from the iTool site.
If you want to download the Adobe Player in Arabic language, before you download the program, you need to change your system language to Arabic. The Adobe Flash Player, will be installed in whatever language it is set for the operating system.