  
  class FilePathField(ChoiceField):
      def __init__(self, path, match=None, recursive=False, allow_files=True,
                   allow_folders=False, required=True, widget=None, label=None,
                   initial=None, help_text=None, *args, **kwargs):
          self.path, self.match, self.recursive = path, match, recursive
          self.allow_files, self.allow_folders = allow_files, allow_folders
          super(FilePathField, self).__init__(choices=(), required=required,
              widget=widget, label=label, initial=initial, help_text=help_text,
              *args, **kwargs)
 
</s> remove                  initial=None, help_text=None, *args, **kwargs):
 </s> add                  initial=None, help_text='', *args, **kwargs): </s> remove                  help_text=None, to_field_name=None, *args, **kwargs):
 </s> add                  help_text='', to_field_name=None, *args, **kwargs): </s> remove                  help_text=None, *args, **kwargs):
 </s> add                  help_text='', *args, **kwargs): </s> remove                  help_text=None, error_messages=None, show_hidden_initial=False,
 </s> add                  help_text='', error_messages=None, show_hidden_initial=False, </s> remove         if help_text is None:
            self.help_text = ''
        else:
            self.help_text = smart_text(help_text)
 </s> add         self.help_text = help_text
                 initial=None, help_text='', *args, **kwargs):
  
  class FilePathField(ChoiceField):
      def __init__(self, path, match=None, recursive=False, allow_files=True,
                   allow_folders=False, required=True, widget=None, label=None,
                 initial=None, help_text='', *args, **kwargs):
          self.path, self.match, self.recursive = path, match, recursive
          self.allow_files, self.allow_folders = allow_files, allow_folders
          super(FilePathField, self).__init__(choices=(), required=required,
              widget=widget, label=label, initial=initial, help_text=help_text,
              *args, **kwargs)
keep keep keep keep replace keep keep keep keep keep
 Removed forced typecasting of help_text/label Field arguments

In any case, setting those variables to non-ascii utf-8 bytestrings
is now considered a programming error. 
django/forms/fields.py