Bug 935877 - Enable VTCS for more locales

Added locales:
* VTCS: da, el, es-ES, tr
Revert "Bug 914680: Add language select to hacks newsletter form."

This selector should only contain English and Spanish. This disables
the select for now. Will add it back in another pull-request.

This reverts commit 1913b8ea936349c599e0acecf9970d18217e299e.
Merge pull request #1403 from flodolo/home_vtcs

Bug 935877 - Enable VTCS for more locales
Fix bug 927522 - update CTA for Greece
Merge pull request #1404 from mozilla/bug-927522-update-cta-for-greece

Fix bug 927522 - update CTA for Greece