To add a new translation file to the project, select Qt|Create New Translation File. In the Add Translation dialog, you can choose the language to create a translation file. A suggested file name is provided, and will be created when you click OK. The translation file is placed in the Translation Files folder in Visual Studio's Solution Explorer. Right-clicking on a translation file displays a menu that allows you to invoke lupdate, lrelease, and Qt Linguist.
See the Qt Linguist manual for more information on Qt's translation tools.