void MainWindow::on_pushButton_clicked()
{
    Translator t;
    t.translate("Hello, world!","En","Ru");
    connect(&t,SIGNAL(dataReceived(QVariant)),this,SLOT(getTranslated(QVariant)));
    connect(&t,SIGNAL(error(QVariant)),this,SLOT(getTranslated(QVariant)));
}
void MainWindow::getTranslated(const QVariant &text)

{
   QString translated = text.toString();
   ui->lineEdit_2->setText(translated);
  }

   QString translated = text.toString();
   QString s =  QString::fromLocal8Bit(translated);