Pontoon: Update Spanish (Mexico) (es-MX) localization of Firefox Screenshots
Pontoon: Update Spanish (Mexico) (es-MX) localization of Firefox Screenshots

Localization authors:
- Roberto Alvarado <ralv888@gmail.com>

mozilla-services/pageshot,mozilla-services/screenshots,mozilla-services/screenshots,mozilla-services/pageshot,mozilla-services/screenshots,mozilla-services/pageshot,mozilla-services/pageshot,mozilla-services/screenshots