This doesn’t really work, though, because while languages are vaguely correlated to regions of the country they don’t match up with entities that have flags. It’s like if the US south had a language common there: what icon would you use? Alabama? It’s also worth noting that just because a language is used in a particular region doesn’t mean it is actually dominant. Coming back to the US, it would be kind of like marking the American southwest as “Spanish” because a lot of people speak it there, and many at home, but even while most conversations in public happen in English.