Can't see russian letters in chat

I have an account in Russian server and as I don't speak russian I changed the client interface to english, but now instead of kirilica white rectangles show up, any ideas on how to fix this?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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