I was analyzing a code of a php website and I found this type pf html with double curly braces. what does it mean.

<div class="vp_dash_links">
    <h4><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path fill="currentColor" d="M9,22A1,1 0 0,1 8,21V18H4A2,2 0 0,1 2,16V4C2,2.89 2.9,2 4,2H20A2,2 0 0,1 22,4V16A2,2 0 0,1 20,18H13.9L10.2,21.71C10,21.9 9.75,22 9.5,22V22H9Z" /></svg> {{LANG comments}}</h4>
    <ul>
        <li><a href="{{LINK dashboard}}" data-load="?link1=dashboard">{{LANG dashboard}}</a></li>
        <li><a href="{{LINK video_studio}}" data-load="?link1=video_studio">{{LANG videos}}</a></li>
        <li class="active"><a href="{{LINK comments}}" data-load="?link1=comments">{{LANG comments}}</a></li>
        <?php if ($pt->config->usr_v_mon == 'on' || $pt->config->sell_videos_system == 'on' || $pt->config->payed_subscribers == 'on') { ?>
            <li><a href="{{LINK transactions}}" data-load="?link1=transactions">{{LANG earnings}}</a></li>
        <?php } ?>
        <?php if ($pt->config->movies_videos == 'on' && PT_IsAdmin()) { ?>
            <li <?php if (!empty($_GET['videos_type']) && $_GET['videos_type'] == 'movies') { echo 'class="active"'; } ?>>
                <a href="{{LINK video_studio?videos_type=movies}}" data-load="?link1=video_studio&videos_type=movies">{{LANG movies}}</a>
            </li>
        <?php } ?>
    </ul>
</div>

please help