Pontoon: Update Spanish (es-MX) localization of Test Pilot Website
Pontoon: Update Spanish (es-MX) localization of Test Pilot Website

Localization authors:
- Roberto Alvarado <ralv888@gmail.com>
- Mauricio Navarro Miranda <mauricio@navarromiranda.mx>
- alex_mayorga <alex_mayorga@yahoo.com>
- Breana Gonzales <breanajones@hotmail.com>

mozilla/idea-town,chuckharmston/testpilot,lmorchard/idea-town,chuckharmston/testpilot,lmorchard/idea-town,meandavejustice/testpilot,mozilla/idea-town,meandavejustice/testpilot,lmorchard/idea-town-server,fzzzy/testpilot,chuckharmston/testpilot,meandavejustice/testpilot,flodolo/testpilot,lmorchard/testpilot,meandavejustice/testpilot,lmorchard/idea-town,chuckharmston/testpilot,fzzzy/testpilot,fzzzy/testpilot,lmorchard/idea-town-server,lmorchard/testpilot,lmorchard/testpilot,lmorchard/idea-town,lmorchard/testpilot,flodolo/testpilot,lmorchard/idea-town-server,mozilla/idea-town,mozilla/idea-town-server,mozilla/idea-town,mozilla/idea-town-server,flodolo/testpilot,lmorchard/idea-town-server,mozilla/idea-town-server,fzzzy/testpilot,mozilla/idea-town-server,flodolo/testpilot