PHP

footer.tpl.php

 <ul class="nav-social__list">
      <?php foreach($variables['social'] as $item): ?>
        <li class="nav-social__list__item">
          <a href="<?php print $item['url']; ?>"
             title="Follow us on <?php print $item['title']; ?>"
             class="nav-social__list__item__link nav-social__icon nav-social__icon--<?php print 
$item['class_modifier']; ?>"><?php
                 print "Wellcome on " . $item['title'];
          ?></a>
        </li>
      <?php endforeach; ?>
    </ul>

In order to render the desired labels to the social media icons, it was necessary to add the following code (the full code block is above) :

 print "Wellcome on " . $item['title'];