In my system, decimal separator is comma. In transaction list in a GUI for all mounts decimal separator is point. But in amount filter field I can't enter point, only comma (which is decimal separator in my system), and, most likely because of that, filtering by amount does not work.

It's bitcoin-qt v0.16.0 with qt 5.9.4 on Gentoo Linux.

![image](https://user-images.githubusercontent.com/4500994/43676682-635500c6-97fe-11e8-9f14-490ecdce4adc.png)

transactionView->setColumnWidth(TransactionTableModel::Watchonly, WATCHONLY_COLUMN_WIDTH);
        transactionView->setColumnWidth(TransactionTableModel::Date, DATE_COLUMN_WIDTH);
        transactionView->setColumnWidth(TransactionTableModel::Type, TYPE_COLUMN_WIDTH);
        transactionView->setColumnWidth(TransactionTableModel::Amount, AMOUNT_MINIMUM_COLUMN_WIDTH);
        columnResizingFixer = new GUIUtil::TableViewLastColumnResizingFixer(transactionView, AMOUNT_MINIMUM_COLUMN_WIDTH, MINIMUM_COLUMN_WIDTH, this);
        if (_model->getOptionsModel())
        {
            
            QStringList listUrls = _model->getOptionsModel()->getThirdPartyTxUrls().split("|", QString::SkipEmptyParts);
            for (int i = 0; i < listUrls.size(); ++i)
            {
                QString host = QUrl(listUrls[i].trimmed(), QUrl::StrictMode).host();
                if (!host.isEmpty())
                {
                    QAction *thirdPartyTxUrlAction = new QAction(host, this); 
                    if (i == 0)
                        contextMenu->addSeparator();
                    contextMenu->addAction(thirdPartyTxUrlAction);
                    connect(thirdPartyTxUrlAction, &QAction::triggered, mapperThirdPartyTxUrls, static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
                    mapperThirdPartyTxUrls->setMapping(thirdPartyTxUrlAction, listUrls[i].trimmed());
                }
            }
        }
        
        updateWatchOnlyColumn(_model->wallet().haveWatchOnly());
        
        connect(_model, &WalletModel::notifyWatchonlyChanged, this, &TransactionView::updateWatchOnlyColumn);
    }
}
void TransactionView::chooseDate(int idx)