Changes to Get an activity, optionally localized. Roles: admin, member, guest if allowed by activity.

added the optional property content/managerAudienceId to the response with the 200 status

added the optional property error/errorId to the response with the 400 status

added the optional property error/errorId to the response with the 401 status

added the optional property error/errorId to the response with the 403 status

added the optional property error/errorId to the response with the 404 status

added the optional property error/errorId to the response with the 500 status