This is a shame indeed 
We, over at ICI Gamers, are a casual and fun gaming community (with about 70-80% Dutch people in it) but we do say that: English is the main language spoken. Of course you are free to squad up with a few other Dutch/Belgium BF5 players and only talk Dutch in a separate channel 
If this tickles your fancy let me know. The only requirement we have is that people are over 18 (due to the occasional profanity on the server). ICI Gamers stands for casualness because everyone has work/life/wife/kids/other social things/etc. and we understand that those have priority over gaming…sometimes 
Interested? Check out our Battlefield post here.