Hello,
I agree that Rue de l'Église is not the French translation of Quartier Saint-Nicolas. My intent was to correct the tag name:nl=Rue de l'Église which was even less correct because Rue de l'Église is absolutely not Dutch. I also don't have local knowledge, but I guess that Rue de l'Église is an alternative name for the part of Quartier Saint-Nicolas which leads to the church. So a more correct tag could be alt_name.