Adapt relative date logic from F# version

src/public/request/full.php

@@ -30,8 +30,8 @@ Layout::pageHead('Full Request');?>
         <div class=card-body>
             <h6 class="card-subtitle text-muted mb-2"><?php
                 if (!is_null($answered)) { ?>
-                    Answered <?=$answered->format('F j, Y')?> (<?php UI::relativeDate($req->history[0]->asOf); ?>)
-                    &bull;<?php
+                    Answered <?=$answered->format('F j, Y')?>
+                    (<?=UI::formatDistance('now', $req->history[0]->asOf);?>) &bull;<?php
                 } ?>
                 Prayed <?=number_format($prayed)?> times &bull; Open <?=number_format($daysOpen)?> days
             </h6>