Proceed to checkout button

Hello,

I have exactly the same problem shared on this topic.
https://xtemos.com/forums/topic/string-translation/

I could translate the “proceed to checkout” button on Cart page using a snippet, but not the button on the mini cart view.
I have to edit the text directly in the Woocommerce .po file. My problem is that the modifications will be lost after the next WC update.

Is there a way to edit the string directly on a WC php file that I would copy then into the theme folders?

Thanks.