Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- `app/controllers/about_controller.rb`:
  Minor conflict caused by glitch-soc's theming system.
  Ported upstream changes.

app/controllers/concerns/registration_spam_concern.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module RegistrationSpamConcern
+  extend ActiveSupport::Concern
+
+  def set_registration_form_time
+    session[:registration_form_time] = Time.now.utc
+  end
+end