- Belgium has three official languages (French: fr-be, Flemish: nl-be and German: de-be).
- Belgium is divided in provinces.
- Provinces in Belgium are either French (thus mainly speak french) or Flemish (thus mainly speak flemish).
- … with the exception of some areas near the german border which mainly speak german. But not the whole province.
- Brussels is not part of a province. It's part of a region called "Brussels Capital". It is French speaking, although it's in the middle of a Flemish province. This is what that looks like: https://twitter.com/Adys/status/1175063489653727233
As you can imagine, most software doesn't account for any of that shit, yet tries to be clever and eg. have websites ignore accept-language.
I recently updated my Nintendo account to be in Belgium. My nintendo account is now half-translated in dutch (NOT flemish). Half because their dutch translation is vastly incomplete. I have no apparent way to change this back without lying about where I live.