public function enqueueFontAwesomeLibs()
    {
        if (($data = $this->didEnqueueLibs(__METHOD__))) {
            return $data; // Did this already.
        } // We only need to enqueue once.

        $data = [
            'styles' => [
                'font-awesome' => [
                    'version' => '4.7.0',
                    'url'     => '//maxcdn.bootstrapcdn.com/font-awesome/%1$s/css/font-awesome.min.css',
                ],
            ],
        ];
        return $this->enqueueLibs(__METHOD__, $data);
    }