To translate texts of controls, which you are setting, you can use the Language
functionality of the form or you can manually change the text according to the desired language. However, for predefined texts set internally by our controls you should use our localization mechanism, as I have suggested in my previous post.
Attached you can find a sample application, where I have set Default, German (Germany) and French (France) translations of standard button, RadButton and RadMenuItem.
I hope that you find this information helpful.
All the best,
the Telerik team
Q2’11 SP1 of RadControls for WinForms is available for download (see what's new); also available is the Q3'11 Roadmap for Telerik Windows Forms controls.