the original English language
Democracy.
Russian.
We could take some kind of compromise option – a less common, but pleasant-sounding language for everyone. For example, Finnish or Irish.)))
But in general, I think that for reporting, it's best to decide based on in-game metrics. Honestly, why should we metagame in this matter? It's obvious that in real life, languages gain the most prevalence precisely for this reason. English spread due to the cultural, economic, and political influence of America. That's how it should be calculated...