ActivityTool: decode path and method_id when we try to get transaction's note

Otherwise, we may get error if we have special characters

product/CMFActivity/ActivityTool.py

@@ -27,7 +27,7 @@ from __future__ import absolute_import
 #
 ##############################################################################
 from six import string_types as basestring
-from Products.ERP5Type.Utils import ensure_list
+from Products.ERP5Type.Utils import ensure_list, str2unicode
 
 import copy
 import socket
@@ -359,7 +359,10 @@ class Message(BaseMessage):
           #      that method !
           method = getattr(obj, self.method_id)
           transaction.get().note(
-            u'CMFActivity {}/{}'.format('/'.join(self.object_path), self.method_id)
+            u'CMFActivity {}/{}'.format(
+              '/'.join([str2unicode(x) for x in self.object_path]),
+              str2unicode(self.method_id),
+            )
           )
           # Store site info
           setSite(activity_tool.getParentValue())