public/scripts/templates/hiddenBlock.html

<div class="text_block hidden_block">
    <small>
        <p>{{text}}</p>
        <div class="fa-solid fa-circle-info opacity50p" data-i18n="[title]Characters and groups hidden by filters or closed folders" title="Characters and groups hidden by filters or closed folders"></div>
    </small>
</div>