If disallowed message is set but no warning message in AbuseFilter. Show the disallowed message in CX card.
Admin can set system message of disallow action on AbuseFilter now. The message doesn't show in CX card. It should be shown as AbuseFilter with warn action.
Actual result: https://commons.wikimedia.org/wiki/File:CX_AbuseFilter_disallowed_card_zhwiki.png
Excepted result: https://commons.wikimedia.org/wiki/File:CX_card_for_AbuseFilter_with_warning_message_and_disallow_action_on_zhwiki.png (I set the AbuseFilter with warn action to show the message in CX card.)