I tried to comment on this answer, but The System told me "Comments cannot contain that content."
Why not!? Can we enable "that content"?
We've had some persistent Chinese spammers across the network, so we introduced a global block on Chinese characters (on sites where we don't expect such characters to normally appear).
Given that the block was only hit 3 times here since introduction and that Brazil has a large Japanese community, I have lifted the block here.