Observed on Special:LanguageStats debug output.
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This warning doesn't exist in MediaWiki yet. Presumably you applied https://gerrit.wikimedia.org/r/#/c/288026/ (unmerged, WIP) locally on translatewiki.net?
That's cool :). The warning seems genuine though. The module has both scripts and styles registered (mwext-Translate.git:/Resources.php#L153), and loaded via addModuleStyles (mwext-Translate.git:/specials/SpecialLanguageStats.php#L121) - which will no longer be allowed in the future.
See also T92459, and back story at https://lists.wikimedia.org/pipermail/wikitech-l/2016-May/085479.html.
Change 289845 had a related patch set uploaded (by Nikerabbit):
Remove unused ext.translate.messagetable from Special:LanguageStats
Change 289845 merged by jenkins-bot:
Remove unused ext.translate.messagetable from Special:LanguageStats