Misheard words is something that Overtone fixes. But it can't fix all, in some cases audio mix and pronunciation are so bad that it's genuinely hard even for a human in their native language to understand. Music also messes up speech-to-text models.

Unfortunately translation of (on-screen) text wasn't built into Overtone. This is something both Netflix and Disney are very aware of, and they already create multiple visual versions of content. On both platforms you can trigger a different visual language version by changing your UI language. Disney movies are most known for this: https://www.youtube.com/watch?v=FxzL7UYyAeg

They use the IMF format to transport content with "overlays" for different languages. In those languages certain frames are swapped out for a translated version. So that an EXIT sign is seamlessly translated to a SALIDA sign in Spanish for example.

Simpler way to do this is forced narrative captions. They are basically a separate captions track to only translate stuff like the on-screen sign you mention. This is combined with regular captions. Netflix turns them on by default I believe, and on Apple TV+ it's called "auto" captions.

The core problem is that AI isn't yet able to do everything. There's a race to the bottom going on for translation companies and things won't get better until AI gets better probably. Companies like Netflix and Disney still spend good money to get high-quality captions, but smaller ones don't unfortunately. Best thing for you to do might be to message the provider so they at least know that people are unhappy.