Why the names of the actions “Mail to Self” and “Save to Files” on the screen “Share” may not be translated into Russian language?

• the first (Copy photo, localised)

• Save to Files (localised)

• but not Mail to self (@)

Code Block 
func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
       let shares = UIContextualAction(
            style: .normal,
            title: "",
            handler: {
                (_, _, completion) in
                let shareController = UIActivityViewController(activityItems: ["Test")], applicationActivities: nil)
                if let popoverController = shareController.popoverPresentationController {
                        popoverController.sourceRect = CGRect(x: UIScreen.main.bounds.width / 2, y: UIScreen.main.bounds.height / 2, width: 0, height: 0)
                        popoverController.sourceView = self.view
                        popoverController.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)
                    }
                self.present(shareController, animated: true, completion: nil)
                completion(true)
            })
        shares.image = UIImage(systemName: "arrowshape.turn.up.right")
        shares.backgroundColor = .darkGray
        return UISwipeActionsConfiguration(actions: [shares])
    }