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)

#include <qt/transactionview.h>
#include <qt/addresstablemodel.h>
#include <qt/bitcoinunits.h>
#include <qt/csvmodelwriter.h>
#include <qt/editaddressdialog.h>
#include <qt/optionsmodel.h>
#include <qt/platformstyle.h>
#include <qt/sendcoinsdialog.h>
#include <qt/transactiondescdialog.h>
#include <qt/transactionfilterproxy.h>
#include <qt/transactionrecord.h>
#include <qt/transactiontablemodel.h>
#include <qt/walletmodel.h>
#include <ui_interface.h>
#include <QApplication>
#include <QComboBox>
#include <QDateTimeEdit>
#include <QDesktopServices>
#include <QDoubleValidator>
#include <QHBoxLayout>
#include <QHeaderView>
#include <QLabel>
#include <QLineEdit>
#include <QMenu>
#include <QPoint>
#include <QScrollBar>
#include <QSignalMapper>
#include <QTableView>