Lower case cyrillic letters are treated as avatar, similar to emojis

[Antreesy]

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Steps to reproduce

1. Create a conversation
2. Type a name, started wih lower-case cyrillic letter
3. See result

Expected behaviour

Nothing should happen, actually. Same should be persistent for other alphabets apart from Latin (Greek, Armenian, e.t.c). Can't remember the realisation, but we could try to restrict usage only with emoji unicode range (or escape all alphabets) - see https://en.wikipedia.org/wiki/List_of_Unicode_characters for reference

Actual behaviour

Talk app

Talk app version: 17.0.0

Custom Signaling server configured: yes

Custom TURN server configured: no

Custom STUN server configured: no

[nickvergessen]

Is a bug in server: https://github.com/nextcloud/spreed/blob/efe34dacf66f4f36b5d47eb92632f4b1d2aab7cd/lib/Service/AvatarService.php#L279