Standardise on 'Quit' rather than 'Exit'

src/bitmessageqt/__init__.py

@@ -73,7 +73,7 @@ class MyForm(QtGui.QMainWindow):
         traySignal = "activated(QSystemTrayIcon::ActivationReason)"
         QtCore.QObject.connect(self.trayIcon, QtCore.SIGNAL(traySignal), self.__icon_activated)
         menu = QtGui.QMenu()
-        self.exitAction = menu.addAction("Exit", self.quit)
+        self.exitAction = menu.addAction("Quit", self.quit)
         self.trayIcon.setContextMenu(menu)
         #I'm currently under the impression that Mac users have different expectations for the tray icon. They don't necessairly expect it to open the main window when clicked and they still expect a program showing a tray icon to also be in the dock.
         if 'darwin' in sys.platform:

src/bitmessageui.py

@@ -515,7 +515,7 @@ class Ui_MainWindow(object):
         self.menuHelp.setTitle(QtGui.QApplication.translate("MainWindow", "Help", None, QtGui.QApplication.UnicodeUTF8))
         self.actionImport_keys.setText(QtGui.QApplication.translate("MainWindow", "Import keys", None, QtGui.QApplication.UnicodeUTF8))
         self.actionManageKeys.setText(QtGui.QApplication.translate("MainWindow", "Manage keys", None, QtGui.QApplication.UnicodeUTF8))
-        self.actionExit.setText(QtGui.QApplication.translate("MainWindow", "Exit", None, QtGui.QApplication.UnicodeUTF8))
+        self.actionExit.setText(QtGui.QApplication.translate("MainWindow", "Quit", None, QtGui.QApplication.UnicodeUTF8))
         self.actionHelp.setText(QtGui.QApplication.translate("MainWindow", "Help", None, QtGui.QApplication.UnicodeUTF8))
         self.actionAbout.setText(QtGui.QApplication.translate("MainWindow", "About", None, QtGui.QApplication.UnicodeUTF8))
         self.actionSettings.setText(QtGui.QApplication.translate("MainWindow", "Settings", None, QtGui.QApplication.UnicodeUTF8))

src/bitmessageui.ui

@@ -979,7 +979,7 @@ p, li { white-space: pre-wrap; }
   </action>
   <action name="actionExit">
    <property name="text">
-    <string>Exit</string>
+    <string>Quit</string>
    </property>
   </action>
   <action name="actionHelp">