Thank you for writing.
Currently the RichTextEditorRibbonBar does not have localization provider. We have a feature request for this in our Feedback Portal
. You can track the item for status changes and add your vote for it here
In this case the styles names are document specific and you can change their names in code:
RadDocument doc =
"Custom Name 2"
radRichTextEditor1.Document = doc;
I hope this helps. Should you have any other questions do not hesitate to ask.