alert.twig in Open Social 8.5

<div class="alert alert-dismissible fade in {{ modifier_class }}" role="alert">

  <button type="button" class="close" data-dismiss="alert" aria-label="{{ "Close"|t }}">
    <span aria-hidden="true">×</span>
  </button>

  <strong>{{ title }}</strong>
  {{ content }}

</div>