Thread:Support/MediaWiki:Interlanguage-link-commons, MediaWiki:Interlanguage-link-wikipedia etc

For some unknown reason, some of these (Special:PrefixIndex/MediaWiki:Interlanguage-link-) appear to have been marked "optional". This is incorrect. You can see on e.g. Russian Wikivoyage that the translation for "Wikipedia" in the sidebar is missing, because translators have ignored it.