OpenPGP Applet should display key creation time instead of key ID

In the public key encryption interface of OpenPGP Applet, the keys are listed displaying the short hex key ID.

It doesn't really matter since it's not involved in fetching keys or the like, but it's good practice to always use the long hex keyid.

If only for the sake of consistency, OpenPGP applet should diplay long IDs too.

That said, long keyids are unsafe too (though a bit less so than short ones). Maybe we shouldn't display them at all and only show fingerprint ?

Update: discussing this during Tails Contributor meeting, we decided the best was creation time (see comments). Changing title accordingly.