This app was mentioned in 2 comments, with an average of 1.50 upvotes
2 week before, i seen in google play Blabber Messenger:
This application translate speech for 12 languages and translate chat for 88 languages.
Georgiy Konovalov is the Software Engineer and Front Developer he seems to have also founded Blabber - speech translator. Could this be the app?
However, you're not gonna make money with free translation app...but if you market translation earbuds and charge $199...well shit, that's a million dollar idea right there.
For those that know about this stuff, Based on Telegram (source code: https://github.com/DrKLO/Telegram).