[GITEA] Improve display of Webauthn keys' creation time

- Unify how the creation time of webauthn keys are shown with GPG and
SSH keys.
- Instead of using the time since, show the date that the key was
created.

(cherry picked from commit 89fb988fdd)
(cherry picked from commit 0a2db6215c)
(cherry picked from commit a39eac2e12)
(cherry picked from commit fa164c9783)
(cherry picked from commit e02dcf0065)

templates/user/settings/security/webauthn.tmpl

@@ -11,7 +11,7 @@
 				</div>
 				<div class="flex-item-main">
 					<div class="flex-item-title">{{.Name}}</div>
-					<span class="flex-item-body time">{{TimeSinceUnix .CreatedUnix ctx.Locale}}</span>
+					<i class="flex-item-body">{{ctx.Locale.Tr "settings.added_on" (DateTime "short" .CreatedUnix) | Safe}}</i>
 				</div>
 				<div class="flex-item-trailing">
 					<button class="ui red tiny button delete-button" data-modal-id="delete-registration" data-url="{{$.Link}}/webauthn/delete" data-id="{{.ID}}">