Community/instance option to disable unicode/emojis in usernames/messages

There is no way for community or instance admins to block certain unicode characters or emojis in usernames and/or messages.

Add a community and instance-wide option for only allowing Latin characters, or any specific type of character, in usernames and/or messages. Or only an option for disabling emojis.

Random unicode characters can negatively impact accessibility to users reliant on screen readers. Community/instance admins may also simply prefer their environment to be text-only.