only install translator when not empty

src/qt/bitcoin.cpp

@@ -121,6 +121,7 @@ int main(int argc, char *argv[])
     QString locale = QLocale::system().name();
     QTranslator translator;
     translator.load(":/translations/"+locale);
+    if (!translator.isEmpty())
         app.installTranslator(&translator);
 
     QSplashScreen splash(QPixmap(":/images/splash"), 0);