Just FYI: As SLE is in late RC phase and Leap still accept changes, and translation-update-upstream is a package that can be broken by any difference, I decided to to perform translation packages split now. >From now on, SLE 15 and Leap 15 translation packages will differ. It keeps safe both products at cost of running all scripts twice from now on. But anyway, thanks for your effort. It helped to keep common translation package as long as possible. In future, I would like to provide a per-package OBS translation-update service that will prevent this type of problems completely. Maintenance of a centralized database of all translation updates and making updates currently takes me too much time.