Various UX improvements

Those are all great suggestions. All of them, except for the last one, seem pretty quick and straightforward.

I suggest doing all of them except the last one on this issue, and do the last one on a separate issue, so as not to block the quick and easy changes.

Or if you still want to do it via one issue, then do it in two separate MRs. I'm happy either way.

Agreed. I'll split that out into a separate issue. I may not even do it here. May be pretty easy with a form alter for our own use case.

Ready for review. Sorry, the changes look bigger than they are because I had to refactor how the form is constructed a bit. Now the code first gathers the list of all eligible term reference fields, then in a separate loop builds the form. This allowed me to collect the list of content types used by a field with the same name.

eh, while I could do the change to select widget in a form alter, it's more complex that I'd like since we need to also load the term tree. Creating follow up to add it to the module...

The refactoring makes sense and looks good. Tests are also happy. RTBC.

Feel free to merge this yourself with your new admin powers 🙂

Thanks!