[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
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 880983 - update Mozilla style guide with link to FxOS brand guidelines pdf

Added a new paragraph and trans block to the brand guidelines PDF.
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.
Merge pull request #954 from kyoshino/bug-865376-other-lang
Fix bug 881929 - add stopwatching blog post to home page news
Merge pull request #962 from chrismore/patch-3

Bug 880983 - update Mozilla style guide with link to FxOS brand guidelines