Pontoon: Updated Dutch (nl) localization of Pontoon Intro
Pontoon: Updated Dutch (nl) localization of Pontoon Intro

Translation authors:
- Ton <tonnes.mb@gmail.com>

jotes/pontoon-intro,jotes/pontoon-intro,Osmose/pontoon-intro,Osmose/pontoon-intro,mathjazz/pontoon-intro,Osmose/pontoon-intro,mathjazz/pontoon-intro,jotes/pontoon-intro,mathjazz/pontoon-intro