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<?php
$prev_link = get_previous_posts_link('<i class="fa fa-arrow-left" aria-hidden="true"></i> oudere berichten');
$next_link = get_next_posts_link('recentere berichten <i class="fa fa-arrow-right" aria-hidden="true"></i>');
if ($prev_link || $next_link) { ?>
  <div id="postnav" class="row">
  <?php if ($prev_link){
      echo $prev_link;
    } if ($next_link){
      echo $next_link;
    } ?>
</div>
<?php } ?>