Pease add support to Mubi. There are a lot of films in different languages made in different countries, it would be amazing if you could make this possible.
My suggestion: I don’t know if you know Lingq, it’s also an app for language learning, there, it appears “new” words in blue and we can mark of yellow the words we don’t know, if we switch to another phrases, the words that we have not marked of yellow become words “already known” (witch is a word with no color in the plataform). It could have something similar here, I spend too much time pausing what i’m regarding to mark the words I know as green. I don’t know if could understand what I explained, but basically the words we don’t mark as yellow in Language Reactor could automatically became green.