vat_code is renamed into tax_identifier

issue6000
review33561002

view/party_tree.xml

@@ -2,7 +2,7 @@
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
 <data>
-    <xpath expr="/tree/field[@name='vat_code']" position="after">
+    <xpath expr="/tree/field[@name='tax_identifier']" position="after">
         <field name="siren"/>
     </xpath>
 </data>