Hey, my recipe has been added in the newest version of Calibre under the new Arabic section
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For now I think Arabic isn't supported under most eReaders, so the best way is to make sure Calibre downloads as ePub (it has RTL support)... and convert to PDF before transferring to your Sony eReader. Since it should show the Arabic fine this way.
Hope this helps until we get proper Arabic support on our devices. I shall be making more Arabic recipes, because I think only one option in the menu makes it look lonely. Are there any you'd like me to start work on first? Link me to the sites, and I'll try and get some made for you.
Regards,
Haz