Bug 881754: add ar & ca locales to firefox/new redirects
Merge pull request #1226 from pascalchevrel/Bug-881754_firefoxnew_locales_redirects

Bug 881754: add ar & ca locales to firefox/new redirects
Bug 915867: Port unsupported/details/ billboard.

Also make sure any unsupported billboards accessed
at */index.html redirect to remove the filename.
Merge pull request #1227 from pmclanahan/port-unsupported-details-915867

Bug 915867: Port unsupported/details/ billboard.
Fix bug 910014: Correct newsletter success string for l10n.
Merge pull request #1228 from pmclanahan/fix-l10n-string-newsletter-success-910014

Fix bug 910014: Correct newsletter success string for l10n.