tool4po --get-list-trans incorrect function call

I tried to run the command to get the translation list on tool4po 0.99 based on the README:

$ python3.1 tool4po.py --get-list-trans 'en_US_360LTS_standard/' 'nl_NL_370LTS_exported/' 'list_trans.xml'

However this failed with the following error message:
        Default Language: nl_NL
--------------------------------------------------------
        Warning: LANGUAGE_PATTERN_DEFAULT is empty!
--------------------------------------------------------
        Error! Wrong mode in run_get_list_trans!
        mode: en_US_360LTS_standard

Upon inspecting the code I found that the command translates into a function call in the following way:
  run_get_list_trans(sys.argv[2], sys.argv[3], sys.argv[4])
This does not seem consitend with the current definition:
  def run_get_list_trans(mode, file_out, folder_tra, folder_ori=''):

I therefore changed the call:
  run_get_list_trans('pair', sys.argv[4], sys.argv[3], sys.argv[2])

Which seems to restore the --get-list-trans functionality.

Please review and merge patch I have attached