https://www.opera.com/client/upgraded
My opera just upgraded and it opened this url as it does after every time it upgrades.

I use Chinese in both Opera and OS.
However, the big text in the center is Korean.
Not all langugages written in squares are the same one!

Furthurmore, I am using Chinese (Simplified), while the text in the description of new features is in Chinese (Traditional).
These two are kind of mutual intelligeble, but not always!

I am not sure if I am posting in the right place, as this should be a problem of your website instead of the browser, but I can't find any other place.