Create hidden text label
function createLabel(key) {
	    var attr = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
	    var text = i18n.get(key, this.config);
	    var attributes = Object.assign({}, attr, {
	      class: [attr.class, this.config.classNames.hidden].filter(Boolean).join(' ')
	    });
	    return createElement('span', attributes, text);
	  }