Add relative date support

Changed Date display to be relative.  If the relative date is hovered over it shows the actual date and time.

templates/item.php

@@ -30,7 +30,7 @@
             <?php endif ?>
         </li>
         <li class="hide-mobile">
-            <?= dt('%e %B %Y %k:%M', $item['updated']) ?>
+            <span title="<?= dt('%e %B %Y %k:%M', $item['updated']) ?>"><?= Helper\relative_time(dt('%e %B %Y %k:%M', $item['updated'])) ?></span> 
         </li>
         <li class="hide-mobile">
             <a href="<?= $item['url'] ?>" id="original-<?= $item['id'] ?>" rel="noreferrer" target="_blank" data-item-id="<?= $item['id'] ?>"><?= t('original link') ?></a>
@@ -43,4 +43,4 @@
         <?= \PicoTools\Template\load('bookmark_links', array('item' => $item, 'menu' => $menu, 'offset' => $offset, 'source' => '')) ?>
         <?= \PicoTools\Template\load('status_links', array('item' => $item, 'redirect' => $menu, 'offset' => $offset)) ?>
     </ul>
-</article>
+</article>