discourse/app/assets/javascripts/admin/models/site-text.js.es6

import { ajax } from 'discourse/lib/ajax';
import RestModel from 'discourse/models/rest';
const { getProperties } = Ember;

export default RestModel.extend({
  revert() {
    return ajax(`/admin/customize/site_texts/${this.get('id')}`, {
      method: 'DELETE'
    }).then(result => getProperties(result.site_text, 'value', 'can_revert'));
  }
});