+// Merge in the legacy language codes, incorporating overrides from the config
+$wgDummyLanguageCodes += [
+ 'qqq' => 'qqq', // Used for message documentation
+ 'qqx' => 'qqx', // Used for viewing message keys
+] + $wgExtraLanguageCodes + LanguageCode::getDeprecatedCodeMapping();
+