Thank you for writing.
Currently the ribbon cannot be localized. 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 addition you can set start position of the FindReplaceDialog with the following code:
var dialog = radRichTextEditor1.RichTextBoxElement.FindReplaceDialog
dialog.StartPosition = FormStartPosition.CenterScreen;
All dialogs can be accessed with their corresponding property.
Please let me know if there is something else I can help you with.
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