fixup! py2/py3: string.letters is locale-dependent and removed in Python 3.

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Base_generateRandomString.py

@@ -3,11 +3,11 @@
 
 """
 from random import choice
-from string import letters, digits
+from string import ascii_letters, digits
 
 character_set = ''
 if include_letters:
-  character_set = '%s%s' %(character_set, letters)
+  character_set = '%s%s' %(character_set, ascii_letters)
 if include_digits:
   character_set = '%s%s' %(character_set, digits)
 return ''.join([choice(character_set) for _ in range(int(string_length))])