Arabic localizations.

Did this one without adult supervision and got lost along the way, eventually naming the ar.lproj folder manually before scratching everything and starting over the right way... there was also a problem with the language "Arabic (world)" not working, so I had to do it all again (again) with the simple "Arabic" language, which I think is why there are like twice as many new files in this commit than are necessary.  Pretty pretty sure I did it right this time, but... just be really careful in accepting this.

Jesus, I feel like my mom.  How do I google an email with Yahoo?