code: def ListLanguageIdentifiers(self):
      
      table_view = views.ViewsFactory.GetTableView(
          self._views_format_type, column_names=['Identifier', 'Language'],
          title='Language identifiers')
      for language_id, value_list in sorted(
          language_ids.LANGUAGE_IDENTIFIERS.items()):
        table_view.AddRow([language_id, value_list[1]])
      table_view.Write(self._output_writer)
docs: Lists the language identifiers.