My main page says 0 sentences translated. I don't know how to "translate sentences". It shows that I have not translated sentences. Which sentences? Thanks
I don't see this, so it might be a new feature they are testing out with some users.
It is most likely referring to translations in the Immersion section, which you can get to by clicking the button up top. That's where Duolingo users translate real-world articles from the language they're learning into their native language.
No, in Immersion. Got to an article and on the right side of the screen it says your tier.