All ERP5 API should manage UTF-8, not unicode.

bt5/erp5_base/SkinTemplateItem/portal_skins/erp5_base/Person_createUserPreference.py

@@ -16,7 +16,7 @@ except ValueError:
   return
 
 preference.setTitle(translateString('Preference for ${name}',
-                     mapping=dict(name=context.getTitle().decode('utf-8'))))
+                     mapping=dict(name=context.getTitle())))
 
 for assignment in context.contentValues(portal_type='Assignment'):
   group = assignment.getGroup(base=True)