Attached zip folder contains two replacement files.
One is another version of module.php, to replace /modules_v3/fancy_treeview/modules.php
The second is a new Dutch nl.mo translation file. I’m afraid the “Kinderen van” problem was a translation issue 🙂 It should have been translated as “Kinderen van ” (note space on end). Easily missed unfortunately, but unavoidable. However, I will add a comment in the translation to help in future.
Translations are stored in the kiwitrees cache, to speed up the process. It is only cleared approximately every 2 hours. So eith wait that time, or go to Administration > Site administration > Clean up data folder and delete the item “cache”. Then return to the original page and refresh it. That will now fix the “van” issue.
The new problem is because in this process I found a new “bug” related to that text. It is fixed in the file you have (module.php) but the language file is not yet uploaded for translation. If you look at Transifex in a couple of days it will be there.