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Not sure if it's the translatewiki's fault (scanned the Translate extension commit history but found nothing), but since the new statistics tables are implemented, the Cantonese (yue) has disappeared from the message group statistics but not from the language statistics. Also, Cantonese is since then missing from the UniversalLanguageSelector. And in Special:Translations, the label "Cantonese" is now replaced by "yue". This has really caused some inconvenience.