spell fix. "sales" should not be "sale" in ERP5.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31277 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/ERP5Type.py

@@ -269,7 +269,7 @@ class ERP5TypeInformation(XMLObject,
       # Movement Group
       'movement_group',
       # Different Aspects
-      'sales', 'purchase', 'internal'
+      'sale', 'purchase', 'internal'
     )
     group_list = ()