Update l10n doc to add advice on how to wrap strings
Fix Bug 868601 - UTM vars on Android Buttons for Play Campaign Tracking
Merge pull request #1569 from kyoshino/bug-868601-gplay-link-params

Fix Bug 868601 - UTM vars on Android Buttons for Play Campaign Tracking
Merge pull request #1564 from pascalchevrel/update_l10n_documentation

Update l10n doc to add advice on how to wrap strings
Fix bug 947310 - redesign MDN home page promo

This also removes/replaces the 2013 addons promo.
Merge pull request #1571 from craigcook/bug-947310-redesign-mdn-home-panel

Fix bug 947310 - redesign MDN home page promo