[bug #2205] (aegypten) Display expiry date in certificate selection dialog (wish)

[Request Tracker]

this bug's URL: http://intevation.de/rt/webrt?serial_num=2205
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Subject: Display expiry date in certificate selection dialog (wish)

If a user has several private keys usable for signatures and wants to sign a
mail, a dialog is presented to select the key. It would be nice if the expiry
date of each key were displayed too.

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