Bug 878448 - Use new mail address for German contribute form

Update contribute mail address for German form on Get Involved page.
Fix bug 874525: Redirect NSS/* and JSS/* to MDN.

Commit 98b4668f redirected the NSS and JSS directories to MDN. This
commit additionally redirects the files and directories that live below
them to MDN.
Redirect /mobile/customize for Bug 876668
Merge pull request #947 from openjck/bug-874525-redirects-1
Bug 877165 - Remove/redirect /firefox/connect page
Merge pull request #949 from sgarrity/bug-876668-redirect-mobile-customize
Merge pull request #948 from sgarrity/bug-877165-remove-connect
Fix bug 653876: Add l10n helper for images.
Merge pull request #907 from pmclanahan/add-image-l10n-helper-bug-653876
[Fix Bug 879867] Return 403 on csrf failures
Merge pull request #951 from Sancus/master
[l10n] Bug 796401 - Enable 15 years template for fy-NL

Adding new localized banner and enabling the template.
Merge pull request #936 from flodolo/bug-878448-new-mail-de

Bug 878448 - Use new mail address for German contribute form
[Fix Bug 748503] Rewrite nightly whatsnew url to firstrun
Add GA track to /firefox/firstrun/ newsletter. Bug 880263.

Remove WebTrends code from email_newsletter_form macro.
Add ability to monitor tabzilla usage bug 832375
Merge pull request #883 from alexgibson/add-ability-to-monitor-tabzilla-usage-bug-832375

Add ability to monitor tabzilla usage bug 832375. Add 'Partner' link to tabzilla 'Get Involved' section bug 880000.
Merge pull request #959 from jpetto/bug-880263-firstrun-newsletter-ga

Add GA track to /firefox/firstrun/ newsletter. Bug 880263.
Merge pull request #955 from flodolo/bug-796401-fyNL_15years

[l10n] Bug 796401 - Enable 15 years template for fy-NL
Bug 863066: Enable footer newsletter forms to support multiple newsletters.