…and sure enough. This app uses one of those moronic map styles which doesn't just use the names for places in the OpenStreetMap database, but also draws them for Wikidata. Great. Those often suck for use on a map, because they tend to include stuff like 'Province X' for a province named 'X', and because the translations stored in Wikidata are often archaic or plain wrong.
The argument the developers who use the wikidata IDs stored in many place name objects to draw in 'missing' translations is that this is surely better than just showing the local name, but this completely misses that in OpenStreetMap name data is already really quite accurate, whereas Wikidata…
As an OpenStreetMap contributor I am not interested in having to keep two databases up-to-date to get names (exonyms and endonyms) to show up correctly. I know a number of developers are pushing this dumb solution, but it is hurting the project more than it is helping.