[fix bug 1009570] Improve a11y of SVG and img alt text content on /firefox/desktop
Fix Bug 1018949 - Too many "Undelivered Mail Returned to Sender" coming from contribute@mozilla.org
Add param to #arrange learn more link for GA. Bug 1020528.
Fix Bug 1020764 - Users on OS X Yosemite see a system requirements error

I haven’t tested it yet but… `10.10` shouldn’t match here.
Fix Bug 1020911 - 500 error when visiting /firefox/memory

This should have been included in my PR #1958
Merge pull request #2082 from kyoshino/bug-1020911-firefox-memory

Fix Bug 1020911 - 500 error when visiting /firefox/memory
Merge pull request #2077 from jpetto/bug-1020528-fx-usage-campaign-link-param

Add param to #arrange learn more link for GA. Bug 1020528.
Update homepage GA tracking. Bug 1001130.
Merge pull request #2080 from kyoshino/bug-1020764-yosemite

Fix Bug 1020764 - Users on OS X Yosemite see a system requirements error
Merge pull request #2063 from alexgibson/bug-1009570-improve-alt-text-firefox-desktop

[fix bug 1009570] Improve a11y of SVG and img alt text content on /firefox/desktop
Remove /about->/contribute redir: fix bug 1020705
Merge pull request #2079 from jgmize/locale-specific-about-contribute-redirect

Remove /about->/contribute redirects: fix bug 1020705
Merge pull request #2070 from kyoshino/bug-1018949-undelivered-mail

Fix Bug 1018949 - Too many "Undelivered Mail Returned to Sender" coming from contribute@mozilla.org
Merge pull request #2084 from mozilla/bug-1001130-update-homepage-ga-tracking

Update homepage GA tracking. Bug 1001130.