Use infinitive form for 'borrow' button, same as return and tranfer.

hardware_provisioning/templates/hardware_provisioning/item_list.html

@@ -26,7 +26,7 @@
             <td class="actions">
                 <div class="button-group">
                   <a href="{% url 'hardware_provisioning:item-borrow' pk=i.pk %}" class="small button">
-                     <i class="fa fa-exchange"></i>&nbsp;Déclarer l'emprunt
+                     <i class="fa fa-exchange"></i>&nbsp;Emprunter
                  </a>
                 </div>
             </td>