No worries! For UX, I would personally add the Greek text by default, and remove the hamburger icon from "Compare Translations". I don't know, my brain is trained to see that icon strictly as a site navigation item.

If you wanted to, perhaps at the top of the page, you can add <select> tags for the translations.

But after figuring out what everything is doing, it's a super nice project; I like it, no need to change anything (above are just suggestions). Thank you for putting it together!