This applies to other languages as well:
The latest comment on http://goproblems.com/17172 for ex. is in Russian -
You can see its prefix in the comments page but in the problem page itself but,
when navigating the solution, there's an encoding issue so it looks like gibberish.
comment encoding issue
Re: comment encoding issue
unfortunately there is some historical encoding issues due to using old character sets. at this point everything is utf8 but there are some old comments and other things that are unreadable now. we may be able to automatically convert some of them but it's a bit tbd