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743d3ea4f3
Specifying wildcard characters which also happen to be regex meta characters for `auto_approve_email_domains`, `allowed_email_domains` and `blocked_email_domains` site settings currently breaks email validation. This change prevents these characters from being specified for these site settings. It does this by switching the site setting type from `list` to `host_list`. The `host_list` validator checks for these characters. In addition, this change also improves the site setting descriptions and introduces a migration to fix existing records.