edx-platform/cms/templates/ux/reference/outline_status_release-lock.html

<div class="status-release">
  <p>
    <span class="sr status-release-label">Release Status:</span>
    <span class="status-release-value">
      <i class="icon icon-lock"></i>
      Will never release - Contains Staff only content
    </span>
  </p>
</div>