Better errors for user permission restrictions

[OJ423]

Non-technical users will be using the TerminusCMS dashboard and it could be wise to make the error messages clearer for when they don't have permissions to perform an action.

In this example, the user is a data reader and they have attempted to edit a document and have this error when opening a change request -

Perhaps something along the lines of -

Your role for this project is 'Data Reader' and you do not have permission to perform this action. Contact the project owner if you need more permissions.

Update 3rd March:
I made my user an info reader and got this when trying to view the documents -