Similar, but not the same. The Dutch language is actually derived from the German language, alot of words look similar. But there are many differences between the grammar and sentence structures. The Germans also use the umlaut more than the Dutch and even a whole extra letter (the ß).
Actually they're getting rid of it according to my littel bro's Geraman teacher. IDK but whatever.
Hops are you sure, I tried my own freeplay map and it worked fine. (Map No.2 tireyard thing, decided a while ago to make my own small map for a freeplay. Disabled everything but stolen car and it worked fine.) And will there be any contamination events in the map?