Use new icon set in footer menu

aleksis/core/templates/core/partials/footer-menu.html

@@ -3,7 +3,7 @@
 {% for item in FOOTER_MENU.items.all %}
   <a class="blue-text text-lighten-4 btn-flat" href="{{ item.url }}">
     {% if item.icon %}
-      <i class="material-icons iconify footer-icon left" data-icon="{{ item.icon }}">{{ item.icon }}</i>
+      <i class="material-icons iconify footer-icon left" data-icon="mdi:{{ item.icon }}"></i>
     {% endif %}
     {{ item.name }}
   </a>