Site in Finnish but requires one page in English

Hey! I'm working on a Finnish site and I'm now adding a "briefly in English". It's not a full site translation but a single page which has some information and a contact form. By default the language for this page is "Finnish" according to the site settings and so it keeps all the headings in the form in Finnish. 

Is it possible to define a different language for a single page with code?

The hoped outcome would be that this one page would host a form with headings in English.

I guess there's no way to do this?

We can use some CSS code to rename text on this page to English. If you share link to page & let me know which text you want to rename, we can help easier

The site is here: https://www.kuopionilmatyynyalus.fi

There will be a some content in English. It's online now but unlinked for now:

1) Briefly in English -page (https://www.kuopionilmatyynyalus.fi/in-english)
2) Contact page in English (https://www.kuopionilmatyynyalus.fi/contact-us)

I'd like to define these two pages to be in English. If that's not possible then I need to translate the parts of the form on the contact page. The site is in Finnish so the form shows some of the text in Finnish.

We can use CSS code to translate text, but with form error message, you try this code first, if it works, I will give CSS code to change form field labels, captions..

https://www.silvabokis.com/squarespace-tips/dynamic-translation-of-squarespace-form-error-messages