code: def _get_filter_title(self, filter_name):
          
          title = getattr(self.filter_list[filter_name], 'title', None)
          if not title:
              title = ' '.join([w.title() for w in filter_name.split('_')])
          return title
docs: Returns the human readable title of a given filter_name. If no title
          attribute is set, the filter_name is used, where underscores are
          replaced with whitespaces and the first character of each word is
          uppercased. Example:
  
          >>> MarkupFormatter._get_title('markdown')
          'Markdown'
  
          >>> MarkupFormatter._get_title('a_cool_filter_name')
          'A Cool Filter Name'