Fix link in teacher add/update view

templates/teachers_add_update.html.tpl

@@ -4,7 +4,7 @@
 
   {{if .Options.Get "update"}}
   <ol class="breadcrumb">
-    <li><a href="/teachers{{query "tpl_layout" "base" "tpl_content" "teachers_show"}}">Docenti</a></li>
+    <li><a href="/teachers{{query "tpl_layout" "base" "tpl_content" "teachers"}}">Docenti</a></li>
     <li><a href="/teachers/{{.Data.ID}}{{query "tpl_layout" "base" "tpl_content" "teachers_show"}}">{{.Data.Name}} {{.Data.Surname}}</a></li>
     <li class="active"><a href="#">Aggiorna</a></li>
   </ol>