I have seen them on my proxies for a while nothing new. My proxy for me right know is showing 3 of these type of ads unblockurass.com
Some times you tend to get ads in other languages on a proxy site, I have this happening some times on my proxy. I will give a try to Elvir's solution.
Once again: Anyone trying elvirs suggestion should get GET IT OK'D FIRST. AdSense E-mail: You DON'T want to get banned for something this stupid (having 1 foreign ad on your site, for example and adding this "EN" code without permission).
hmm.. its because of the lack of the content. elvirs's suggextion will definitely help and its ok with TOS.
I run a proxy site that I've noticed the same thing with, but I believe the ads are in Farsi not in Arabic since I get a fair amount of traffic on that proxy from Iran.