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/validators/registration_form_time_validator.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class RegistrationFormTimeValidator < ActiveModel::Validator
+  REGISTRATION_FORM_MIN_TIME = 3.seconds.freeze
+
+  def validate(user)
+    user.errors.add(:base, I18n.t('auth.too_fast')) if user.registration_form_time.present? && user.registration_form_time > REGISTRATION_FORM_MIN_TIME.ago
+  end
+end