Thread:User talk:Rua/vroom (nl)/reply (6)

means that the term was borrowed into language xx. If the word was borrowed into Middle Dutch, then would be ok. But of course it can only be borrowed once in a language's history, so any subsequent languages would use.

Yes, there is a normalisation scheme for Middle Dutch, it's at WT:ADUM. In general, you can find a lot of information on practices and rules for individual languages on these "About..." pages.