For the time being, RadEditor for ASP.NET AJAX can be localized only with resx files
. For your convenience, I converted the xml file to resx files and you can use them to localize the new editor. Please, note that the nl-NL xml localization is not up-to-date and some of the localization strings of the new editor do not exist in it and you will see some not translated labels, buttons, etc.
the Telerik team