All pages are dynamically added - our built in control SitePanelBar( RadPanelBar) is bound to CmsSiteMapDataSource. If you use standard edition you can enable localization and create pages in several languages. The text of each item equals to the page MenuLabel.
Another option is just changing the menu label or adding the RadPanelBar items declaretively and setting the text of each item manually.
the Telerik team