Merge remote-tracking branch 'origin/master' into merge-upstream

Conflicts:
 	README.md
 	app/controllers/follower_accounts_controller.rb
 	app/controllers/following_accounts_controller.rb
 	app/serializers/rest/instance_serializer.rb
 	app/views/stream_entries/_simple_status.html.haml
 	config/locales/simple_form.ja.yml

app/views/settings/preferences/show.html.haml

@@ -4,7 +4,7 @@
 = simple_form_for current_user, url: settings_preferences_path, html: { method: :put } do |f|
   = render 'shared/error_messages', object: current_user
 
-  .actions
+  .actions.actions--top
     = f.button :button, t('generic.save_changes'), type: :submit
 
   %h4= t 'preferences.languages'