The TextBoxRibbonUI can be localized using the same approach used in the RibbonBar, however you'll need to update the Resource Keys as follows:
RibbonViewGalleryButtonMore
RibbonViewGalleryButtonUpDown
RibbonViewQATCustomize
RibbonViewQATMinimize
RibbonViewQATShowAbove
RibbonViewQATShowBelow
RibbonViewWindowTitleDivider
I attached a sample project demonstrating how to use the above resource keys with the RadRichTextBoxRibbonUI. Please have a look at the solution and let me know if it works for you.
Regards,
Tina Stancheva
the Telerik team
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