How to use the scratch-gui.localesInitialState function in scratch-gui

// parts[1]: either :id or 'editor'
    // parts[2]: undefined if no :id, otherwise either 'editor' or 'fullscreen'
    if (parts.indexOf('editor') === -1) {
        guiInitialState = GUI.initPlayer(guiInitialState);
    }
    if (parts.indexOf('fullscreen') !== -1) {
        guiInitialState = GUI.initFullScreen(guiInitialState);
    }
    return guiInitialState;
};

module.exports.guiReducers = GUI.guiReducers;
module.exports.guiInitialState = GUI.guiInitialState;
module.exports.guiMiddleware = GUI.guiMiddleware;
module.exports.initLocale = GUI.initLocale;
module.exports.localesInitialState = GUI.localesInitialState;

dispatch(previewActions.getProjectInfo(id, token));
    }
});

module.exports.View = connect(
    mapStateToProps,
    mapDispatchToProps
)(EmbedView);

GUI.setAppElement(document.getElementById('app'));
module.exports.initGuiState = GUI.initEmbedded;
module.exports.guiReducers = GUI.guiReducers;
module.exports.guiInitialState = GUI.guiInitialState;
module.exports.guiMiddleware = GUI.guiMiddleware;
module.exports.initLocale = GUI.initLocale;
module.exports.localesInitialState = GUI.localesInitialState;