Like multiple times said before,
update the language files!!!
They won't be used (heck, they
CAN'T be used) if you don't update them.... Update your Plus! and use "DefaultLg.dat" or in this case "Lang_Nederlands.ini" as your starting point. If this means retranslating everything, then you still should do it.....
See all the other threads where you posted/suggested your other translations!!!!
Sorry, but this is useless... I explained many times before what you should do and gave you important links before... PLEASE, read them and follow the instructions....
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EDIT
and IMO, don't post translations anymore before you updated and checked them yourself. (wrong ampersands, too long lines, etc...)
Another thing: You asked/suggested that I point out some mistakes in the translation, well I wont do that before YOU checked them out before and updated the file... It's very time-consuming to do this, I know, but a good translator SHOULD do this before posting...