Silent empty content/action blocks in pages other than overview

Conflicts:
	pootle/templates/editor/main.html
Refere to the `name` property for consistency
Cleanup: aligned prefixed properties
Partial pick: Get rid of top sub menu, move 'Contact Us' link to the top menu, improve styling
(cherry picked from commit e09b735e42a4ddb5788cc60cebda402e9964ef4a)

Pick notes: The cherry pick notice above is from Evernote. Some of the styles
    were not picked because they altered the color scheme, or rendered an
    ugly UI. Also had to adjust the template changes because we had the
    "contact us" link in the footer.

Conflicts:
	pootle/static/css/style.css