diff -r 36ed2bf7ad3d -r de49060d4be3 web/formwidgets.py
--- a/web/formwidgets.py	Thu Dec 09 15:27:01 2010 +0100
+++ b/web/formwidgets.py	Thu Dec 09 15:27:02 2010 +0100
@@ -567,6 +567,8 @@
 
     def _render(self, form, field, renderer):
         req = form._cw
+        if req.lang != 'en':
+            req.add_js('jquery.ui.datepicker-%s.js' % req.lang)
         domid = field.dom_id(form, self.suffix)
         # XXX find a way to understand every format
         fmt = req.property_value('ui.date-format')