Fix home page l10n tag

And cache-bust Font Awesome
Add GA tracking to download buttons
and update GA tracking label for all links
Bug 1071924
Merge pull request #2468 from sgarrity/bug-1071924-dev-ga

Add GA tracking to download buttons
Add missing eventLabel to download button GA
Bug 1071924
Merge pull request #2467 from craigcook/anniversary-pages-fixes

Fix home page l10n tag
Merge pull request #2470 from sgarrity/bug-1071924-dev-ga

Add missing eventLabel to download button GA