Partial pick of Evernote's evernote/pootle@2f453d22

Pick note: These changes might be required by the following picks.

    The rest of the changes in that commit are either necessary or where
    later dropped or changed at Evernote.
Make #footer stick to bottom

Conflicts:
	pootle/templates/layout.html
URL cleanups in Evernote dropped code

Change last URL template tags using references to views to instead use URL
names.
Make #footer stick to bottom
Fix footer overlapping with the content on tall pages

Conflicts:
	pootle/static/css/style.css
Partial pick: Added 'Terms and Conditions' links to the footer

Pick note: Only picked the CSS styles.

Conflicts:
	pootle/templates/layout.html
Added delete method to <Directory> (fixed http://bugs.locamotion.org/show_bug.cgi?id=2776)

Conflicts:
	pootle/apps/pootle_app/models/directory.py
Used iterator to avoid filling the internal queryset cache
Let's use the name `resource` for clarity

Pick notes: Also did additional changes in the view and template to
    completely switch to the new naming.

Conflicts:
	pootle/apps/pootle_translationproject/templates/translation_project/overview.html
	pootle/apps/pootle_translationproject/views.py
Minor change to ease picking next commit

Change comes from evernote/pootle@11508964.
Styling improvements/fixes (main page, header)

Conflicts:
	pootle/static/css/style.css
	pootle/templates/_main_tabs.html
	pootle/templates/home/base.html
Minor change to ease picking next commit (again)

Change comes from evernote/pootle@11508964.
Remove second column on overview pages

Note: this doesn't remove any underlying code that gathers data

Pick note: This drops important bits of our UI that we need to get back:

    - Descriptions (instructions)
    - Actions
    - Goals
    - Tagging

Conflicts:
	pootle/apps/pootle_project/templates/project/overview.html
	pootle/apps/pootle_translationproject/templates/translation_project/overview.html
	pootle/static/css/style.css
	pootle/templates/languages/overview.html