PHPMailer::lang( string $key ): string

4607    protected static function lang($key)4608    {4609        if (count(self::$language) < 1) {4610            self::setLanguage(); //Set the default language4611        }4612 4613        if (array_key_exists($key, self::$language)) {4614            if ('smtp_connect_failed' === $key) {4615                //Include a link to troubleshooting docs on SMTP connection failure.4616                //This is by far the biggest cause of support questions4617                //but it's usually not PHPMailer's fault.4618                return self::$language[$key] . ' https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting';4619            }4620 4621            return self::$language[$key];4622        }4623 4624        //Return the key as a fallback4625        return $key;4626    }