There is SetUndoRedoCmdTextUS method in AIUndoSuite.
From documentation:
AIAPI AIErr(* AIUndoSuite::SetUndoRedoCmdTextUS)(const ai::UnicodeString &undoText, const ai::UnicodeString &redoText, const ai::UnicodeString &cmdText)
Specifies the localizable text(Unicode String) for Undo, Redo, and History Panel menu items. Illustrator uses these strings for the menus and history panel as needed.
Note: Illustrator automatically handles the undo mechanism for plug-in filters. Filters should not use this function.
Parameters:
undoText - Unicode String text for the Undo menu.
redoText - Unicode String text for the Redo menu.
cmdText - Unicode String text for history panel