setup.py install fails with missing locale/bo/LC_MESSAGES/fdroidserver.mo

Already reported here: https://forum.f-droid.org/t/f-droid-server-building-error/1670

reproduces here: https://gitlab.com/Bubu/reproducer/-/jobs/43537367

https://gitlab.com/Bubu/reproducer/blob/master/.gitlab-ci.yml#L12

Not sure if I'm doing something wrong there, but python3-babel is installed. And running make -C locale didn't make a difference either.