Multiple sheets in a single Draw.io project

It is not possible to change the language of Draw.io, unless you change your own computer's language setting to English, which would then change the language of Draw.io accordingly.

If this is not feasible, you can try adding a ?lang=en at the end of the URL (like https://www.draw.io/?lang=en) to force it to appear in English, but it will not remember this setting though, you would have to set it every single time you visit the site.

Try printing the diagram using File, Print and then print that to a PDF using the browser's built-in print functionality (works on Macs, needs a PDF printer driver in Windows).