Add "Change Cardholder" action to card actions menu

Set an icon for this action only for the icon-only edit button next to
the cardholder field because no other card action has an icon. The card
actions menu doesn't look good if there's only one action with an icon.

(cherry picked from commit ca4b690b66c0050e38e02f87dbb3567b14ca0e40)

• GnuPG-bug-id: T7018