When $wgLoginLanguageSelector is set to true, Special:Login and Special:CreateAccount show a language selector that statically created based on system message MediaWiki:Loginlanguagelinks. It could be improved with ULS.
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As far as I can see, that special page has no extension points. This means it is not possible to do this in a maintainable way without core changes.
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It sounds like a hook would be useful inside makeLanguageSelector (includes/specialpage/LoginSignupSpecialPage.php) to allow extensions to override the default behaviour.
The default behaviour when the hook variable passed by reference is an empty string we could return
count( $links ) > 0 ? $this->msg( 'loginlanguagelabel' )->rawParams( $this->getLanguage()->pipeList( $links ) )->escaped() : '';