dialog_delete_username
Open a dialog to confirm the deletion of the username of a user.
The required id argument identifies the user resource. on_success can be
repeated and is forwarded to the confirmed deletion. The dialog is only opened
on a writable site for users allowed to use mod_admin_identity, and only when
the resource currently has a username.
{% button text="Remove login" action={dialog_delete_username id=id on_success={reload}} %}