### 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)"
{
    this->model = _model;
    if(_model && _model->getOptionsModel())
    {
        for(int i = 0; i < ui->entries->count(); ++i)
        {
            SendCoinsEntry *entry = qobject_cast<SendCoinsEntry*>(ui->entries->itemAt(i)->widget());
            if(entry)
            {
                entry->setModel(_model);
            }
        }
        setBalance(_model->getBalance(), _model->getUnconfirmedBalance(), _model->getImmatureBalance(),
                   _model->getWatchBalance(), _model->getWatchUnconfirmedBalance(), _model->getWatchImmatureBalance());
        connect(_model, SIGNAL(balanceChanged(CAmount,CAmount,CAmount,CAmount,CAmount,CAmount)), this, SLOT(setBalance(CAmount,CAmount,CAmount,CAmount,CAmount,CAmount)));
        connect(_model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(updateDisplayUnit()));
        updateDisplayUnit();
        
        connect(_model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(coinControlUpdateLabels()));
        connect(_model->getOptionsModel(), SIGNAL(coinControlFeaturesChanged(bool)), this, SLOT(coinControlFeatureChanged(bool)));
        ui->frameCoinControl->setVisible(_model->getOptionsModel()->getCoinControlFeatures());
        coinControlUpdateLabels();
        
        for (const int &n : confTargets) {
            ui->confTargetSelector->addItem(tr("%1 (%2 blocks)").arg(GUIUtil::formatNiceTimeOffset(n*Params().GetConsensus().nPowTargetSpacing)).arg(n));
        }
        connect(ui->confTargetSelector, SIGNAL(currentIndexChanged(int)), this, SLOT(updateSmartFeeLabel()));
        connect(ui->confTargetSelector, SIGNAL(currentIndexChanged(int)), this, SLOT(coinControlUpdateLabels()));