code: def _create_metadata_converter_action(self):
          
          icon = resources_path('img', 'icons', 'show-metadata-converter.svg')
          self.action_metadata_converter = QAction(
              QIcon(icon),
              self.tr('InaSAFE Metadata Converter'),
              self.iface.mainWindow())
          self.action_metadata_converter.setStatusTip(self.tr(
              'Convert metadata from version 4.3 to version 3.5.'))
          self.action_metadata_converter.setWhatsThis(self.tr(
              'Use this tool to convert metadata 4.3 to version 3.5'))
          self.action_metadata_converter.triggered.connect(
              self.show_metadata_converter)
          self.add_action(
              self.action_metadata_converter, add_to_toolbar=self.full_toolbar)
docs: Create action for showing metadata converter dialog.