Fix bug 1003209 - australis home promo link

Link directly to the video
Merge pull request #1942 from craigcook/bug-1003209-australis-promo-link

Fix bug 1003209 - australis home promo link
Replace fx desktop intro base64 image with file path. Bug 10003205.
Merge pull request #1945 from jpetto/bug-10003205-fx-desktop-css-issues

Replace fx desktop intro base64 image with file path. Bug 10003205.
[fix bug 1003342] Update the support link on firstrun
Merge pull request #1946 from alexgibson/bug-1003342-update-support-link-on-firstrun

[fix bug 1003342] Update the support link on firstrun
Fix typo in mac screenshot on /new page
Fixes Bug 1003389
Merge pull request #1947 from sgarrity/screenshot-typos

Fix typo in mac screenshot on /new page
Fix Bug 1003611 - Download buttons of Firefox for Japanese/Mac should have the ja-JP-mac locale
Merge pull request #1948 from kyoshino/bug-1003611-ja-mac-button

Fix Bug 1003611 - Download buttons of Firefox for Japanese/Mac should have the ja-JP-mac locale