Pontoon: Update German (de) localization of Mozilla Learning Network
Pontoon: Update German (de) localization of Mozilla Learning Network

Localization authors:
- Michael Köhler <michael.koehler1@gmx.de>

mozilla/learning.mozilla.org,mozilla/teach.mozilla.org,mozilla/teach.webmaker.org,mozilla/teach.mozilla.org,mozilla/teach.webmaker.org