void paint2d::changeEvent( QEvent* event )
{
	QMainWindow::changeEvent( event );

	if ( event->type() == QEvent::LanguageChange ) {
		fileMenu->setText( QCoreApplication::translate( "paint2d", "File" ) );
        }
}

QEvent::LanguageChange - The application translation changed.

QString QCoreApplication::translate ( const char * context, const char * sourceText, const char * disambiguation, Encoding encoding, int n ) [static]
Returns the translation text for sourceText, by querying the installed translation files. The translation files are searched from the most recently installed file back to the first installed file.