Message that the change will take some seconds

src/mainwindow.cpp

@@ -429,6 +429,8 @@ void MainWindow::setupSettingsModal() {
 
        QObject::connect(settings.comboBoxCurrency, &QComboBox::currentTextChanged, [=] (QString currency_name) {
             this->slot_change_currency(currency_name);
+             // Tell the user that it will take some seconds
+            QMessageBox::information(this, tr("Currency Change"), tr("This change will take some seconds"), QMessageBox::Ok);
           
             
              });