Pontoon: Update Spanish (es) localization of Mozilla Learning Network
Pontoon: Update Spanish (es) localization of Mozilla Learning Network

Localization authors:
- Inma Barrios <inma.barrios@mozilla-hispano.org>

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