Bug 925995 - Horizontal scrolling on the new channels page on RTL

Fix is in menu.css so will apply to all pages using the Firefox menu
Merge pull request #1305 from pascalchevrel/Bug-925995_Horizontal_scrolling_channel_page_RTL

Bug 925995 - Horizontal scrolling on the new channels page on RTL
Add de/congstar CTA for firefox/os/. Bug 917334.
Bug 925931 - Restore secondary home page templates

Continuing the 80/10/10 split while we work on some further design options before going 100% with the new home page.
Merge pull request #1308 from craigcook/bug-925931-restore-homepage

Bug 925931 - Restore secondary home page templates
Merge pull request #23 from mozilla/bug-917334-update-cta-fxos-de

Bug 917334 update cta fxos de