Bugfix for previous commit

I know it is fixed later, but want to fix it here since the commit that fixes
this introduces other bugs and don't need this to be around when debugging.
Upgraded Magnific Popup plugin to v0.9.8
Added data API for linking to contact forms

Fixes evernote/pootle#42.
Added maintenance mode via middleware

In order to enable this, the `MAINTENANCE_MODE` setting needs to be set to
`True`. The sample configuration files include more information on how the
middleware works.

Fixes evernote/pootle#39.

Conflicts:
	requirements/base.txt
Followup: Record addition of maintenance mode to release notes
Followup: Adjust the maintenance template