Twitter's now available in Arabic, Farsi, Hebrew and Urdu, with the task of translating the likes of the retweet button, list classifications and the fail whale largely done by a task force of volunteers. The languages were added to Twitter's translation to-do list back in January, with around 13,000 helpers getting the job done since then. You can change your settings to one of the newly supported languages in the drop-down account menu, while Twitter continues to plug more linguistic holes at its translation center -- interested polyglots can consult the second source below.