In Polygon, we can create statements in a variety of languages, however, the statement can only be read in one language in a specific contest. You can generate a PDF for a different language, but that requires the contestant to use the PDF rather than the HTML page.

So I hereby ask MikeMirzayanov to add a way to select the problem language, perhaps at the sidebar of the contest, and also inside the problem itself, when more languages are available for selection. As an example, 2020-2021 ACM-ICPC Brazil Subregional Programming Contest has statements with three languages available: Portuguese, Spanish and English, however, as a contestant, you can only read the statements in English.

As a bonus, I don't think we can change the input, output, example, text in HTML, right? In the generated PDF we can, by editing olymp.sty, problem.tex and statements.ftl, but there's no such thing for HTML. It would also be nice to be able to localize these strings.