add DummyLocalizer.get_supported_languages() that is now required in testERP5Web.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@26308 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/tests/utils.py

@@ -110,6 +110,9 @@ class DummyLocalizer:
             {'selected': False, 'id': 'pl', 'title': 'Polish'},
             {'selected': False, 'id': 'fr', 'title': 'French'},]
 
+  def get_supported_languages(self):
+    return ('en', 'fr', 'pl')
+
   def changeLanguage(self, lang):
     self.lang = lang