Lalit 4ab824dc4c emoji: Disallow . in custom emoji names. ...

Until now, custom emojis with "periods" in their name were allowed, even though
they don't really fit the pattern of how we name them, and in fact the Markdown
processor would not render such custom emoji. Fix this by just disallowing the
character.

Also update the error strings accordingly.

Note that this does not include a migration to eliminate any existing custom emoji with this 
character in their name.

Fixes #24066.

2023-01-31 17:28:33 -08:00

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