I tried again and for some unknown reason it works now. No idea what I did wrong the first time. I did the following quick'n dirty fix:
After this line in jscript_square.php
error_html += "<li> " + error.message + " </li>";
I added
error_html=error_html.replace("Credit card number is not valid","Translation Text Here");
error_html=error_html.replace("CVV is not valid","Translation Text Here");
error_html=error_html.replace("Expiration date is not valid","Translation Text Here");
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