FEATURE: Add locale defaults for Unicode username whitelist

config/site_settings.yml

@@ -463,7 +463,13 @@ users:
     validator: "UnicodeUsernameWhitelistValidator"
     default: ""
     locale_default:
+      cs: "[ěščřžýáíéóůúďťňĚŠČŘŽÝÁÍÉÓŮÚĎŤŇ]"
       de: "[äöüßÄÖÜẞ]"
+      fi: "[åäöÅÄÖ]"
+      ja: '[\p{Han}\p{Katakana}\p{Hiragana}]'
+      ko: '\p{Hangul}'
+      zh_CN: '\p{Han}'
+      zh_TW: '\p{Han}'
   reserved_usernames:
     type: list
     list_type: compact