Does any of the following help to get a better understanding? <https://wiki.openstreetmap.org/wiki/Uk:Beginners%27_guide> or <https://wiki.openstreetmap.org/wiki/Beginners%27_guide>

Anyway, the following so-called relation describes Saarland in the map database including its name in different languages. The Ukrainian name is already set, though. <https://www.openstreetmap.org/relation/62372>

So let me close this hint for now.