Translate the permission role relationship according to the display_name

[meyer59]

When translation key display_names has been set in the resources\lang\vendor\nova-permission-tool\en\permissions.php it show the translation only in the Permission index page. This Pr aim to show the translation also when adding/editing/showing Role's permission. This is more consistant with https://github.com/vyuldashev/nova-permission/issues/21#issuecomment-416731516