discourse/app/assets/javascripts/admin/components/site-setting.js.es6

import BufferedContent from 'discourse/mixins/buffered-content';
import SiteSetting from 'admin/models/site-setting';
import SettingComponent from 'admin/mixins/setting-component';

export default Ember.Component.extend(BufferedContent, SettingComponent, {
  _save() {
    const setting = this.get('buffered');
    return SiteSetting.update(setting.get('setting'), setting.get('value'));
  }
});