It’s Microsoft. For some insane reason, excel formulas are localized. E.g. German Excel uses “SUMME()” instead of “SUM()”.

It’s insanely annoying because it sport of makes it more difficult to ask for help (I.e. only Germans might know what SVERWEIS does). And if you manage to find a solution in English, you need to translate it.

There’s a slight difference in that “Ostsee” is the common name. If the German chancellor decides to call it “Deutsche See” tomorrow, the name would continue to be “Ostsee”, because that’s how language usually works.

“Gulf of America” is just a dictator’s wish of a common name. The people of OpenStreetMap decided to use the tag “official_name:en_US” for that reason, while keeping “Gulf of Mexico” for the commonly used “name:en-US”.

Yaml is just arcane bullshit to actually write as a human. Nor is it intuitively clear how yaml serializes.