Do you restock hand cards at the end of each turn? Different language editions seem to have different rulings
You don't restock your hand of cards, you restock the four money cards on the board which are available to take, the same way you restock the tiles available to buy. That looks consistent with the English and German rules; I would assume the Dutch is the mistake, that they meant until each supply has four cards/tiles. 

I would say the English and German rules are fairly specific about that, and it takes some substantial stretching to get them to mean anything else. And the Dutch sounds like fairly awkward phrasing for restocking the supply on the table, which surely must be done.