Remove required from telephone field

templates/administratives_add_update.html.tpl

@@ -49,7 +49,7 @@
 
     <div class="form-group">
       <label class="control-label" for="administrative_internal_telephone">Telefono (interno)</label>
-      <input type="text" name="InternalTelephoneNumber" class="form-control" id="administrative_internal_telephone_number" placeholder="Numero di telefono (interno)" {{if .Options.Get "update"}} value="{{.Data.Administrative.InternalTelephoneNumber}}" {{end}} required>
+      <input type="text" name="InternalTelephoneNumber" class="form-control" id="administrative_internal_telephone_number" placeholder="Numero di telefono (interno)" {{if .Options.Get "update"}} value="{{.Data.Administrative.InternalTelephoneNumber}}" {{end}}>
     </div>
 
     <div class="form-group">