I'm probably not going to buy it myself - I just don't like it enough, honestly, and I prefer to wait for Renaissance which seems a LOT better at first glance - but a friend of mine is probably going to buy it.
Is there anything specific you have in mind for the Wiki? Just Dutch card names or something else?
At the bottom of each wiki page there is a table called 'other language versions'. For each Nocturne card, a new row with the Dutch name has to be added.
If neither of you is comfortable with the wiki code or has time to edit the wiki I would also appreciate just a list of all the card names so I can add them myself. A picture of the strip that goes between the cards would also suffice.
Secondly, when there's a new expansion I always compare every Dutch card to every original English card to check if there are any translation errors. If there are any, I make a scan of them and modify this page:
http://wiki.dominionstrategy.com/index.php/Translation_errors_on_the_Dutch_cards_-_Vertaalfouten_op_de_Nederlandse_kaarten . I then send a mail to the customer service of 999 games to inform them of said errors.
I think the least amount of work for you would be to just take pictures or make scans of the rulebook, as the rulebook contains pictures of the cards as well, which are the same pictures they use for the cards. Although the resolution has to be good enough to be able to read the text on the pictures of the cards in the rulebooks.