The command text 'Delete Duplicated Frames' used in the `GPENCIL_MT_cleanup` menu is not correct grammar for what the command does. Keyframes removed by this command may be duplicate keys without having been duplicated. It also does not match the name of the command in `DOPESHEET_MT_context_menu`. [[ https://developer.blender.org/diffusion/B/browse/master/release/scripts/startup/bl_ui/space_dopesheet.py$676 | space_dopesheet.py ]] This patch fixes the grammar, gets the command's text to match the `DOPESHEET_MT_context_menu`, and corrects the description in the [[ https://docs.blender.org/api/current/bpy.ops.gpencil.html#bpy.ops.gpencil.frame_clean_duplicate | Python API documentation ]]. Reviewed By: antoniov Differential Revision: https://developer.blender.org/D16887