@Thomasmore: I didn’t know foreign language groups in Western lands were dissolved, but it makes sense, often those groups were an excuse for people like me to get out of the way, pretend you’re doing a lot of work and because these congregations have no native speaking CO or other oversight, they are often nearly independent from branches, lack ‘spiritual food’ (even getting English literature was spotty because the branch doesn’t like shipping small orders) leading to independent Bible study and thinking. Truly you want to be in a foreign language congregation if you can, it’s awesome, relaxed and people are often transient and illegal themselves so you don’t get tied down, elders (if they even have them) have a hard time structuring service and meetings and you don’t get ratted out if you do something wrong and every male and female is looking for a partner to be able to stay in the country (the stories I could tell you about drinking and grinding dancing with Russian sisters).
My last assignment in foreign language, the entire Chinese congregation had very pro-China leanings (if you want to see true skin color racism, go see Asians) and eventually the entire congregation defected and was disbanded, thinking about it decades later, I suspect the elders may have had ties with the Chinese government.
In other countries where I’ve been, there are many ‘local’ languages as the country itself is multi-lingual. There will be no way they set an official language in those areas. I know for a fact there are still multi-language congregations in my country of origin, since officially there are 3 native languages.