I'm on the international english server.
And it's showing this when I whisper to a friend.
I do not speak this language.

That's Russian. Were you on the Russian server at all recently?

throws an old thread in here
'old' as in it was from more than a year ago, but seems similar?

Yeah, it's a similar issue I'd say but the dialogs on that menu shouldn't be effected by a community platform issue. :x