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>

flodolo/testpilot,lmorchard/testpilot,6a68/idea-town,lmorchard/testpilot,6a68/testpilot,mozilla/idea-town,lmorchard/testpilot,mozilla/idea-town-server,mozilla/idea-town-server,6a68/idea-town,lmorchard/idea-town,fzzzy/testpilot,6a68/idea-town,meandavejustice/testpilot,chuckharmston/testpilot,mathjazz/testpilot,mozilla/idea-town-server,6a68/idea-town,fzzzy/testpilot,meandavejustice/testpilot,mozilla/idea-town,lmorchard/idea-town,6a68/testpilot,6a68/testpilot,dannycoates/testpilot,mozilla/idea-town,flodolo/testpilot,chuckharmston/testpilot,6a68/testpilot,mathjazz/testpilot,lmorchard/idea-town,lmorchard/idea-town,meandavejustice/testpilot,mozilla/idea-town-server,flodolo/testpilot,chuckharmston/testpilot,fzzzy/testpilot,lmorchard/idea-town-server,fzzzy/testpilot,meandavejustice/testpilot,dannycoates/testpilot,lmorchard/testpilot,dannycoates/testpilot,flodolo/testpilot,lmorchard/idea-town-server,mozilla/idea-town,lmorchard/idea-town-server,chuckharmston/testpilot,lmorchard/idea-town-server,mathjazz/testpilot,dannycoates/testpilot,mathjazz/testpilot