Faxe-376: Added subscribe icon

Author: Simon L. Lange

web/themes/custom/fds_faxe_theme/templates/includes/action-buttons.html.twig

@@ -17,5 +17,10 @@
         <span class="icon fa fa-print"></span>
       </a>
     </div>
+    <div>
+      <a href="/abonner" class="action-button">
+        <span class="icon fa fa-envelope"></span>
+      </a>
+    </div>
   </div>
 </div>