Show date used on invite codes

[cesy]

Title:
Show date used on invite codes

Area:
invite codes

Summary:
On the invite codes page, change "Sent on" to be "Sent on/Used on" and include the date used for codes used directly, not sent by email.

Description:
On the manage invite codes page, if you sent an invite code by email, it shows date sent as well as the email address. If you give a code to someone and they use it directly, not by email, then it doesn't show a date at all. It would be useful to see a date used, so those codes sort properly into the timeline.

Poll #2222 Show date used on invite codes

Open to: Registered Users, detailed results viewable to: All, participants: 30

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This suggestion:

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Should be implemented as-is.
18 (60.0%)

Should be implemented with changes. (please comment)
5 (16.7%)

Shouldn't be implemented.
0 (0.0%)

(I have no opinion)
7 (23.3%)

(Other: please comment)
0 (0.0%)