Update AW_Advancednewsletter.csv

Just browsed the H&O repository a little and checked out the translations.
Spotted two kind of major issues:
* The first being: First Name => Achternaam
* The second being: successfully deleted, was translated as succesvol geupdate.

Didn't test/check my changes though.
Merge pull request #27 from BKer/patch-1

Update AW_Advancednewsletter.csv