closes #8307

closes #8214
closes #8048

Co-authored-by: Thorsten Claus <thorstenclaus@web.de>

closes #8234

This should fix undefined method `og' for #<OpenGraphReader::Base:0x00007f73c53f2308 @bases={}>
for sites that have OpenGraph tags of other namespaces but no actual OpenGraph core tags

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

closes #8002

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

closes #8006

fixes #8001

closes #8003

fixes #7808

closes #7913

closes #7912

closes #7826

closes #7772

Fixes #6564.

closes #7775

closes #7769

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

I overlooked this when reviewing #6418 since it is excluded on travis
because of the @nophantomjs tag (so it didn't fail). But since we block
http:// embeds now, we need to use https:// for the tests.

Use this tag for tests which can't work with PhantomJS, but which we
can run with Selenium using some other profile (not implemented here).

closes #6418

Use markdown-it-html5-embed plugin so user can embed audio and
video using the markdown link syntax []() in the HTML5 way.

closes #7690

This is an internal active record table and shouldn't be touched. When
this is truncated you need to fix it again by running
`bin/rails db:environment:set RAILS_ENV=test`

This is a temporary fix until there is a new version of
database_cleaner.

closes #7606

closes #7605

closes #7601

closes #7600