How can I change a duplicate name label in the quotes module?

I noted that I duplicated a name label in the quote module, the point is when I try to changed for other label name, returned the old name.

But if I change other label in the same module, it works fine. Any idea, to do this label name change?

please see this post maybe it help you: How do I change a field label on a quote line item?

I found this file, but the information that I want to change in the quotes module, it’s not there.

Pls have a look

If you can give me another idea, I would really appreciate it!!!