https://github.com/bitcoin/bitcoin/blob/5180a86c96bc05d2a731f70f36aae28ab5a3fad4/src/qt/sendcoinsdialog.cpp#L339

I think this is %1, not %2
}
            else 
            {
                ui->labelCoinControlChangeLabel->setStyleSheet("QLabel{color:black;}");
                
                QString associatedLabel = model->getAddressTableModel()->labelForAddress(text);
                if (!associatedLabel.isEmpty())
                    ui->labelCoinControlChangeLabel->setText(associatedLabel);
                else
                    ui->labelCoinControlChangeLabel->setText(tr("(no label)"));
                CoinControlDialog::coinControl->destChange = dest;
            }
        }
    }
}
void SendCoinsDialog::coinControlUpdateLabels()
{
    if (!model || !model->getOptionsModel())
        return;
    updateCoinControlState(*CoinControlDialog::coinControl);
    
    CoinControlDialog::payAmounts.clear();
    CoinControlDialog::fSubtractFeeFromAmount = false;
    for(int i = 0; i < ui->entries->count(); ++i)
    {
        SendCoinsEntry *entry = qobject_cast<SendCoinsEntry*>(ui->entries->itemAt(i)->widget());
        if(entry && !entry->isHidden())
        {
            SendCoinsRecipient rcp = entry->getValue();
            CoinControlDialog::payAmounts.append(rcp.amount);