Poll add form choices

Number 3 was discussed here: ✨ Poll getting created with single choice Closed: works as designed

So I think the only thing this issue could add is changing the label of the button to add choices, which I think is not worth it personally as this is quite standard for Drupal.

Going to close this one in favour of ✨ Add the remove button to poll choices Active as this improves the form.
Single choices are currently supported so nothing to do for that.
Renaming the add button is in my eyes not needed.