Add in Latin American Spanish - es-419
Use correct supporting page admin url
Merge pull request #309 from alphagov/regional-locale

Add in Latin American Spanish - es-419

https://www.pivotaltracker.com/story/show/44968811
Merge pull request #310 from alphagov/fix-supporting-page-url-in-mappings

Use correct supporting page admin url

https://www.pivotaltracker.com/story/show/45070821
Remove extra release to get rid of flickering

Couldn't see any reason why this line was in here to start with. The
previous two selectors should match all the positions the sticky
element should be in.
Fix language reference in es-419