QT: Proper way to change color according to translation

Question

I have an unusual situation. The customer wants certain background colors changed depending on the current translations. Currently I am using the normal QT translator which works great for text however there is no option for QColor or any other type as far as I can see.

So my current workaround is that I also use the tr() for the setStyleSheet call.

As dynamic translation is also required I reimplemented the changeEvent to include

    ui-> retranslate(this) 

however this does not change the styleSheet. So I also added the

    ui->pb->setStyleSheet(tr("background-color: rgb(150,150,150)"));

inside the changeEvent. As you can see below the implementation is not really elegant so I would like to know if there is a better, preferred alternative I can use.

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    uiSetupDone = true;

    connect(...);
    ...

}

...

void MainWindow::changeEvent(QEvent *event)
{
    // In the case of events changing the application language
    if (event->type() == QEvent::LanguageChange) {
        ui->retranslateUi(this);    // translate the window again


       //Check if the UI is fully setup so that we do not try to access not initialized variables
       if (uiSetupDone)
        { 
          //Update the background colors depending on the language
          ui->pbProgramSelect->setStyleSheet(tr("background-color: rgb(150,150,150))":
          ...
        }
    }
 
    QMainWindow::changeEvent(event);
}