Restrict some crawling bots + arabic localization update

Baidu is causing a huge use of cpp cause of its crawling bots. its webmaster tools are in Chinese  only so it is hard to configure the rate of crawling. Baidu  and other "bad/unwanted" bots also added to denial list of  robots.txt. Baidu is restricted also in htaccess. 

the update contains a new revision of Arabic localization.