This deprecated feature should no longer be used, but is still available for reasons of backwards compatibility.
This feature was deprecated in version 1.29.0. Please see $wgExtraLanguageCodes for an alternative way to use this feature.
$wgDummyLanguageCodes=['als'=>'gsw','bat-smg'=>'sgs','be-x-old'=>'be-tarask','bh'=>'bho','fiu-vro'=>'vro','no'=>'nb','qqq'=>'qqq',# Used for message documentation.'qqx'=>'qqx',# Used for viewing message keys.'roa-rup'=>'rup','simple'=>'en','zh-classical'=>'lzh','zh-min-nan'=>'nan','zh-yue'=>'yue',];