changin the names of “invoice” and “slip” in pdf documents

hello, I need to change the text “delivery note”, in the pdf that is generated, for “order”. Similarly, I need to change where it says “Invoice” to “delivery note”, where can I do this? I have tried to do it with locotranslate changing the translations but I see that it does not affect the PDF
Thanks.

The page I need help with: [log in to see the link]