Google will soon be able to translate message text within any app
According to Caesar Sengupta, vice president for product management at Google, Tap to Translate will allow users to copy text from anywhere on your device and translate it automatically in a floating window. And, to make it easier to carry on conversations, users will also be able to compose replies in their native language, have it translated, and send that back. Just like features like Now on Tap, all of this happens in an overlay window so users never leave the app they are working in.
Sengupta said this will be especially useful when used in messaging apps:
The exact languages to be supported is unclear right now. Tap to Translate is expected to arrive on Android devices in the first quarter of 2016.
source: The Next Web