Isn't this essentially telling other languages how they're supposed to work?
Well it's liker the German government saying that they will always write München even in English; that doesn't say anything about how English speakers (or German private citizens speaking English) might choose to refer to Munich. In Malaysia "Datuk" is used as a combined honorific with a name when speaking otherwise completely idiomatic English rather than being translated into "Sir So-and-so" It's not really differe…
I suppose this sort of thing instantly confuses me - why aren't we already calling the city München if that is what the Germans are doing?