Twitter has announced today that it has enabled tweet translation, powered by Bing, on both its official iOS app, as well as on the web. The feature was previously available on TweetDeck, and has been tested off and on for a while now.
Twitter made the announcement, fittingly, via a Tweet earlier today:
You can follow the link in the tweet (or by clicking here) to get more information about how the translation works. However, it is very simple to operate. All you have to do when you see a tweet in another language is click the globe icon within the tweet and Twitter will take care of the rest.
As of its launch, Twitter's translation feature supports translation for more than 40 languages. If for some reason you decide you'd rather not have the option (though why wouldn't you?) you can easily disable the feature from your account settings.