Translation error

It seems I can’t translate the sentence: “No thank you, i’ll supply print ready artwork.” My site is in Dutch, but I think this could be with every translation.

When I change the sentence to: ‘No thank you. I will supply print ready artwork.’ (So removing the comma and changing the ” ” to ‘ ‘) at line 208 in product-template.php, I can translate it.

I can do it myself now, but when the plugin is updated it will remove itself. Can you please look into this? Thanks in advance!