Short answer
HubSpot's KB: the support portal is a login-protected space for customers' tickets; it replaces the legacy customer portal. It appears in your domain's primary language. With Sensitive Data on, customers can't view attachments there.
1. In HubSpot
The relevant screen in my demo portal.

2. Worth knowing
For more languages, look at your domain language settings.
3. Related
Customer portal and domain language.