This is probably very minor, but according to https://phabricator.wikimedia.org/source/mediawiki/browse/master/languages/data/Names.php, https://github.com/wikimedia/operations-mediawiki-config/blob/master/wmf-config/InitialiseSettings.php#L17369 and https://github.com/wikimedia/mediawiki-extensions-Wikibase/blob/master/repo/includes/WikibaseRepo.php#L1803, din and smj are listed in multiple places when they shouldn't need to be.
din has been added to Names.php now, so it's probably redundant to list it as an extra language in wmgExtraLanguageNames.
smj is in wmgExtraLanguageNames, so it doesn't also need to be in getMonolingualTextLanguages.