- fix typos in license

 - remove not needed imports


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28873 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/TradeModelRule.py

@@ -5,10 +5,10 @@
 #                    Łukasz Nowak <luke@nexedi.com>
 #
 # WARNING: This program as such is intended to be used by professional
-# programmers who take the whole responsability of assessing all potential
+# programmers who take the whole responsibility of assessing all potential
 # consequences resulting from its eventual inadequacies and bugs
 # End users who are looking for a ready-to-use solution with commercial
-# garantees and support are strongly adviced to contract a Free Software
+# guarantees and support are strongly advised to contract a Free Software
 # Service Company
 #
 # This program is Free Software; you can redistribute it and/or
@@ -28,7 +28,7 @@
 ##############################################################################
 
 from AccessControl import ClassSecurityInfo
-from Products.ERP5Type import Permissions, PropertySheet, Constraint, interfaces
+from Products.ERP5Type import Permissions
 
 from Products.ERP5.Document.Rule import Rule