[l10n] Bug 796401 - Enable 15 years template for fy-NL

Adding new localized banner and enabling the template.
Bug 878068 - Create a link-able view for /firefox in Bedrock
[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.
Bug 880002 Add Link to Partnerships page in bedrock footer
Bug 863066: Upgrade basket-client to v0.3.4.
Merge pull request #955 from flodolo/bug-796401-fyNL_15years

[l10n] Bug 796401 - Enable 15 years template for fy-NL
[l10n] Bug 796062: Get Involved page for Tamil (ta)

* Add Tamil (ta) to LOCALES_WITH_MOZ15.
* Add Tamil's contact to LOCALE_CONTACTS, minor fixes (proper
alphabetical order, fixed alignment on first item).
* Add localized banner to media and css.
* Add CSS fixes for slides 2, 10, 14, 15 (text displayed out of
background)
Bug 863066: Enable footer newsletter forms to support multiple newsletters.
Merge pull request #963 from pmclanahan/newsletter-forms-allow-multiple-newsletters
Merge pull request #957 from Sancus/master
Make /firefox/ a redirect to /firefox/fx/ as per pmclanahan's comment
Merge pull request #953 from kyoshino/bug-878068-firefox-link
Merge pull request #960 from pmclanahan/upgrade-basket-client-bug-863066
Merge pull request #961 from flodolo/bug796062-tamil-15years
Merge pull request #956 from retornam/bug-880002-add-partnerships-footer
Bug 865376 - "Other languages" link on firefox/all/ downloads goes to nothing

Simply hide the localized-testing section when no test builds are
available.