To use this example, follow the directions found at http://doc.trolltech.com/4.5/linguist-hellotr.html The basic steps are: Run "lupdate hellotr.pro" Run "linguist hellotr_la.ts" Enter "Orbis, te saluto!" as a translation for "Hello, World!" (don't forget the exclamation mark!). Click the "?" to change it to a check mark to mark it done. Save the file. Then either Choose "File|Release" in Qt4 Linguist Run "lrelease hellotr_la.ts" Now when you run the example, you'll see the translated text in the PushButton.