Conversion problem in function pathauto_cleanstring

It seems that pathauto module in function pathauto_cleanstring doesn't convert all the characters properly. I mean, Polish character ś or Ś is not converted into s or S, which should be done. The utf8 code of ś is c59b and of Ś is c59a. I solved this by adding this to the array named $translations, so the last line (254 of pathauto.module file) looks now like this:

    'Ăź'=>'ss','Ĺż'=>'ss', "\xc5\x9b"=>'s', "\xc5\x9a"=>'S');