Pontoon: Update Dutch (nl) localization of AMO
Pontoon: Update Dutch (nl) localization of AMO

Localization authors:
- Mark Heijl <markh@babelzilla.org>

mozilla/olympia,eviljeff/olympia,bqbn/addons-server,psiinon/addons-server,psiinon/addons-server,diox/olympia,diox/olympia,psiinon/addons-server,mozilla/olympia,mozilla/addons-server,diox/olympia,mozilla/addons-server,psiinon/addons-server,mozilla/olympia,wagnerand/addons-server,wagnerand/addons-server,mozilla/olympia,eviljeff/olympia,eviljeff/olympia,wagnerand/addons-server,mozilla/addons-server,mozilla/addons-server,bqbn/addons-server,diox/olympia,eviljeff/olympia,bqbn/addons-server,bqbn/addons-server,wagnerand/addons-server