Change status terminology for approved requests

[super-cooper]

Description

When requests are approved, the status is changed to "Requested." My users and I have found this terminology to be incredibly confusing, since the title is requested by a user, and then set to "Requested" after it's approved.

Desired Behavior

At minimum, I think it makes far more sense to just change the status to "Approved" for an approved request. Perhaps also a "Processing" status for when a title is downloading or a physical copy is being shipped.

Additional Context

Making these changes to statuses provides valuable context to the user and makes it easier for admins to track the status of their titles. Changing "Requested" to "Approved" should be a minimal string change, and I don't believe adding the additional status would be a huge lift either.

My solution right now is to just leave requests as "Pending" forever if I approve of them, and only click the "Approve" button when I have purchased or downloaded the title. This is not particularly helpful as there is no indication when I have viewed a request, and it's not obvious which requests will be approved in the future, besides that they sit as "Pending" for longer than requests which get declined.

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