Hello Glen Karam,
Thank you for posting in Microsoft Community forum.
Where did you see "a status 500.19 Internal Server Error"?
Please provide the screenshot with PKIview.msc console.
I cannot see en-US under c:\Windows\system32\CertSrv in my lab.
If you have any question or concern, please feel free to let us know.
Best Regards,
Daisy Zhou