Add the Discarded label for the All My Requests page.

This introduces a "[Discarded]" label for discarded review requests on the
All My Requests page.

It also localizes the labels, simplifies the code a little, and changes
the logic so that "[Discarded]" will take precedence over "[Draft]" for
non-published review requests.

NOTE: I accidentally committed this, but go ahead and review it and I'll make any necessary changes.

Tested each state and saw what I expected to see.