Dutch website translation update

I'll change that.

> BTW, how can I make edits/updates?

Just open the file:
https://github.com/unchecky/unchecky-translate/blob/master/website/nl.js
and click on the edit button (the pencil icon in the right top corner).

Here's a simple tutorial of the process:
https://docs.joomla.org/Using_the_Github_UI_to_Make_Pull_Requests