[add] added missing translations

[add] validator added to calculate price fields for mcl and usd line edits

src/main/python/mainApp.py

@@ -10,7 +10,7 @@
 from datetime import datetime, timedelta
 from qr_code_gen import Image
 from PyQt5 import QtWidgets, QtCore, QtChart
-from PyQt5.QtGui import QIcon, QRegExpValidator, QFont, QPainter
+from PyQt5.QtGui import QIcon, QRegExpValidator, QFont, QPainter, QDoubleValidator
 from PyQt5.QtChart import QChart, QChartView, QPieSeries
 from PyQt5.QtCore import QThread, pyqtSlot, QDateTime, QSize, Qt, QTranslator, QRegExp
 from PyQt5.QtWidgets import QMainWindow, QPushButton, QTableWidgetItem, QMessageBox, QDesktopWidget, QHeaderView, \
@@ -172,6 +172,10 @@ def __init__(self, parent=None):
         # Market Page
         self.exchange_market_request_button.clicked.connect(self.get_mcl_exchange_market)
         self.exchange_market_request_button.setToolTip(self.tr("can be refreshed once in 20 seconds"))
+        self.regex_amount = QRegExp('[1-90_].+')
+        self.amount_validator = QRegExpValidator(self.regex_amount)
+        self.mcl_amount_lineEdit.setValidator(self.amount_validator)
+        self.usd_amount_lineEdit.setValidator(self.amount_validator)
         self.mcl_amount_lineEdit.editingFinished.connect(self.calculate_usd_price)
         self.usd_amount_lineEdit.editingFinished.connect(self.calculate_mcl_price)