Multi-Language Add-In for Visual Studio

How to translate classes that inherit Microsoft.Office.Tools.Ribbon.RibbonBase?

I'm creating an Outlook addon using VSTO.
Multi-Language Add-In doesn't translate classes that inherit Microsoft.Office.Tools.Ribbon.RibbonBase.
RibbonBase is similar to System.Windows.Forms.Form. There is a file named .Designer.vb that contains all ribbon controls.

Thank you for your support,
Filippo Bottega.