eplaced by the
   * second to the tenth argument.
   * @param {string} id The ID of the string we want.
   * @param {...(string|number)} var_args The extra values to include in the
   *     formatted output.
   * @return {string} The formatted string.
   */
        getStringF(id, var_args) {
            const value = this.getString(id);
            if (!value) {
                return '';
            }

            const args = Array.prototype.slice.call(arguments);
            args[0] = value;
            