Allow error messages to be translated

[wesleybl]

BUG/PROBLEM REPORT / FEATURE REQUEST

What I did:

With Volto, on a website in Portuguese, I accessed a private page with an anonymous user.

What I expect to happen:

I expect the error message to be displayed in Portuguese.

What actually happened:

The message in English was displayed:

You are not authorized to access this resource.

This message comes from Zope exception:

Zope/src/ZPublisher/HTTPResponse.py

Line 833 in 0c4fc50

m = "You are not authorized to access this resource."

Would it be possible for the message to be a msgid instead of a string?

[icemac]

There was once #631 but it went nowhere.

You could come up with a PR to push your feature request forward.