add dynamic language change support

add "en" ts

qad/application/emainwindow.h

@@ -92,6 +92,7 @@ protected:
 	void closeEvent(QCloseEvent * );
 	bool eventFilter(QObject * o, QEvent * e);
 	void timerEvent(QTimerEvent * e);
+	void changeEvent(QEvent * e);
 	QMenu * createPopupMenu();
 	void addToRecent(const QString & path);
 	void prepareRecent();