Merge pull request #21830 from owncloud/systemtags-sidebar-permissions

apps/systemtags/appinfo/app.php

apps/systemtags/js/systemtagsinfoview.js

apps/systemtags/tests/js/systemtagsinfoviewSpec.js

core/css/systemtags.css

core/js/js.js

core/js/systemtags/systemtagmodel.js

core/js/systemtags/systemtagsinputfield.js

core/js/tests/specHelper.js

core/js/tests/specs/systemtags/systemtagsinputfieldSpec.js