You can paste the code in any of the sections (Header, Body or Footer), but since this affects form submit we recommend placing it in the Body or Footer Section, in order to prioritize page loading order correctly.
You can change the text to be in any language of your choosing.
Non-latin characters will break the code so swap all non-latin characters with HTML entities like:
¡ change to ¡
& change to &
" change to "
You can find a full list of HTML entities in this article.