Use a partial to share code between mobile and desktop, add the new route to the RegistrationController, drop flash message for closed registrations

fixes #7767

fixes #7910

closes #7966

Using token doesn't make much sense when you can generate new tokens
right below.

closes #8006

They don't make sense on that page, because at this stage, the user
already has an account and also has already entered their password.

closes #8005

fixes #8001

closes #8003

fixes #7997

closes #7998

closes #7926

fixes #7840

closes #7884

fixes #7838

closes #7909

closes #7868

Facebook removed the API and facebook integration is broken now, so lets
remove it.

closes #7874

closes #7833

This is required to make url_for(StatusMessage.new) work

closes #7814

Fixes #6564.

closes #7775

closes #7769

This feature only worked on the same pod and was more confusing than
useful.

This is needed to properly initialize Handlebars partials without
a document ready handler.

fixes #7739

closes #7740

fixes #7727

closes #7642
fixes #7633

closes #7690

closes #7683

Fixes #7679

Fixes #7681

closes #7682

closes #7624

fixes #1649

closes #7601