docs: def _create_actions(self):
          """ Create associated actions """
          self.action_to_lower = QtWidgets.QAction(self.editor)
          self.action_to_lower.triggered.connect(self.to_lower)
          self.action_to_upper = QtWidgets.QAction(self.editor)
          self.action_to_upper.triggered.connect(self.to_upper)
          self.action_to_lower.setText(_('Convert to lower case'))
          self.action_to_lower.setShortcut('Ctrl+U')
          self.action_to_upper.setText(_('Convert to UPPER CASE'))
          self.action_to_upper.setShortcut('Ctrl+Shift+U')
          self.menu = QtWidgets.QMenu(_('Case'), self.editor)
          self.menu.addAction(self.action_to_lower)
          self.menu.addAction(self.action_to_upper)
          self._actions_created = True