I run Ubuntu and the bleeding edge browser from Google, called Chromium. It’s a daily release of what is known as Chrome on other OSs. I can do this because I also have Firefox (and at least 4 others) installed for when something doesn’t work as it should.
If you’re translating from English, just click on the microphone on the bottom right of the input box, speak your text, and choose the language you want to translate to. In fact, you can even click on the “Listen” feature to hear the translated words spoken back to you!
I would experiment and say more, but it would seem that Chromium doesn’t have access to this function either!