Remove specific text and in every language and pdf.

Hi, I am trying to remove a specific string, the “unless you have expressly agreed otherwise;” one in the return and refund section, and I want this change to be applied in every language and in the pdf file, without messing with the syncing of the document.

I have tried the function.php method on my child theme, with str_replace, but nothing changes.

Any help will be appreciated. Thanks.