Store notice dismiss button text change

Hello,

I would like to ask for help in regards to woocommerce store notice dismiss button text. I’d like to inform clients about free shipping this is why word “Dismiss” is not the best option in this case. Could you please help me how can I change “Dismiss” (in polish “Odrzu?”) to “OK” or simple “X”?
I have child theme so maybe there is some code I can use to make it work?

PS. I saw two similar topics on the forum but unfortunately this solution does not work in my case – I have no idea why since I already created child theme and paste the code in functions.php of child theme, is there a possibility I chose wrong place to do this?

Thank you in advance for your assistance

Website URL where we can see more details: https://aflodesign.pl/