Translation license GPLv3 only, vs. or later
https://weblate.bubu1.eu/projects/routenbuch/routenbuch-app/#information says "only", which isn't as flexible down the road. Can be changed in https://weblate.bubu1.eu/settings/routenbuch/routenbuch-app/ and https://weblate.bubu1.eu/settings/routenbuch/glossary/
Looks like just me and @MondStern contributed there so far, and I am happy about making it "or later".