If you need to work on several foreign languages, Google Translate website and its app are very helpful in getting those task done. However, it could still be troublesome to switch to different app when translate for a single phrase, for example a phrase inside an app. Google has updated their Translate App with the new Tap to Translate functionality!
Google has added the new conversation translate feature on the latest Android Marshmallow. By simply copying the text and tapping the Google Translate App floating icon, the phrase will be automatically translated and appeared on the windows.
Source : engadget