Hello,
In fact, I cannot remember that I have ever met in Germany or the Netherlands a Turkish or Moroccan Wikimedian. Maybe there was one, but he spoke good German and presented himself as User:Encylco-dude81 so that I did not notice the "migration background". :-)
According to the statistics only 0.2% of the page views in Germany go to Wikipedia in Turkish, by the way.Turks in Germany belong largely to social classes that tend not to read much in an encyclopedia, and when they need one for school, they presumably copy their homework from Wikipedia in German.
Kind regards Ziko