Allow non-approvers to see pending approvals as read-only

[fawques]

Hi, we just added this extension to our company, and we are very happy with it, except for one small issue. I am managing the simultaneous release of +20 items, but I'm not the final approver, so if I go to the "Releases to Approve" page, I only see this

It would be super helpful to show there the actual list of releases to approve, even if I can't act on them, so I can double-check what I'm sending to the approver.

[gustavobergamim]

Related to issue #38