Bug 922373 - Please add @Mozilla Twitter link to website footer on mozilla.org

And Bug 921833 - [es-ES] [pt-BR] Twitter link on mozilla.org directs to
English Twitter account
Bug 947992 - Request to Verify YouTube on Mozilla.org
Activate home add-ons 2013 promo. Bug 941923.
Replace VTCS home promo with Fx OS promo. Bug 941185.

- Replace L10n promo tag for Webmaker with 'promo_webmaker'.

- Remove all VTCS images/CSS.
Merge pull request #1458 from kyoshino/bug-922373-footer-social

Fix Bug 921833 and 922373, footer social links
Bug 919581 - Remove conditional for en-US/locales on about/ intro paragraph
Merge pull request #1542 from flodolo/about_intro

Bug 919581 - Remove conditional for en-US/locales on about/ intro paragraph
Merge pull request #1539 from jpetto/bug-941185-replace-vtcs-with-fxos-promo

Replace VTCS home promo with Fx OS promo. Bug 941185.
Merge pull request #1541 from jpetto/bug-941923-activate-addons-promo

Activate home add-ons 2013 promo. Bug 941923.
Merge pull request #1540 from kyoshino/bug-947992-youtube-verification

Fix Bug 947992 - Request to Verify YouTube on Mozilla.org
Fix Fx CSS transition bug on addons promo. Bug 941923.
Enable cache for transbar.jsonp
Merge pull request #1545 from kyoshino/bug-906943-transbar-cache

Enable cache for transbar.jsonp
Merge pull request #1543 from jpetto/bug-941923-addons-promo-fix

Fix Fx CSS transition bug on addons promo. Bug 941923.