### Howto replace a stuck transaction with another with higher fee ?

bitcoind 0.15.0

The marking option "Request Replace-By-Fee" in the sending transaction GUI page should have a better understandable text.

The sender does not "request" anything when creating the transaction. This is just a tag for a later possibility, as I understand as a rather normal user.

I would suggest something like

"Let me increase the fee of this transaction later, if it should not get confirmed in expected time ('Replace-By-Fee' feature)"
{
        
        questionString.append("<hr /><span style='color:#aa0000;'>");
        questionString.append(BitcoinUnits::formatHtmlWithUnit(model->getOptionsModel()->getDisplayUnit(), txFee));
        questionString.append("</span> ");
        questionString.append(tr("added as transaction fee"));
        
        questionString.append(" (" + QString::number((double)currentTransaction.getTransactionSize() / 1000) + " kB)");
    }
    
    questionString.append("<hr />");
    CAmount totalAmount = currentTransaction.getTotalTransactionAmount() + txFee;
    QStringList alternativeUnits;
    for (BitcoinUnits::Unit u : BitcoinUnits::availableUnits())
    {
        if(u != model->getOptionsModel()->getDisplayUnit())
            alternativeUnits.append(BitcoinUnits::formatHtmlWithUnit(u, totalAmount));
    }
    questionString.append(tr("Total Amount %1")
        .arg(BitcoinUnits::formatHtmlWithUnit(model->getOptionsModel()->getDisplayUnit(), totalAmount)));
    questionString.append(QString("<span style='font-size:10pt;font-weight:normal;'><br />(=%2)</span>")
        .arg(alternativeUnits.join(" " + tr("or") + "<br />")));
    if (ui->optInRBF->isChecked())
    {
        questionString.append("<hr /><span>");
        questionString.append(tr("This transaction signals replaceability (optin-RBF)."));
        questionString.append("</span>");
    }
    SendConfirmationDialog confirmationDialog(tr("Confirm send coins"),
        questionString.arg(formatted.join("<br />")), SEND_CONFIRM_DELAY, this);