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

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

tsl143/addons-frontend,kumar303/addons-frontend,tsl143/addons-frontend,mozilla/addons-frontend,tsl143/addons-frontend,tsl143/addons-frontend,kumar303/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,aviarypl/mozilla-l10n-addons-frontend,aviarypl/mozilla-l10n-addons-frontend,mozilla/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,mozilla/addons-frontend,kumar303/addons-frontend,mozilla/addons-frontend,kumar303/addons-frontend