Pontoon: Update German (de) localization of AMO
Pontoon: Update German (de) localization of AMO

Localization authors:
- paul.trevor <paul.trevor@gmx.de>

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