add workflowSuccess in the Attributes as entry for presesnting message after launched QuickLink
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE QuickLink PUBLIC "sailpoint.dtd" "sailpoint.dtd">
<QuickLink action="workflow" category="Manage" messageKey="יצירת תיבה משותפת" name="Custom- Create SharedMailbox WF QL" significantModified="1780209069121">
<Attributes>
<Map>
<entry key="workflowName" value="Custom - Create SharedMailbox WF"/>
<entry key="workflowSuccess" value="requset submitted, notification will be send to you when finished"/>
</Map>
</Attributes>
<QuickLinkOptions allowSelf="true">
<DynamicScopeRef>
<Reference class="sailpoint.object.DynamicScope" name="admins"/>
</DynamicScopeRef>
</QuickLinkOptions>
</QuickLink>