I think there's a bug in Weblate because I've seen this before: where
the English provides only an <other> the translation comes back with
only a <one>. That's wrong. Try adding a <one> in the English case to
see if that makes a difference.
When those became an advanced feature I added a warning for upgrading
players who'd miss them. That was long ago, and the warning was only
supposed to last a release or two.
