On English Wikipedia (but not on MediaWiki.org or Commons), the ULS widget is displayed next to the article interlanguage links. It is extremely confusing to associate the USER language settings with the ARTICLE languages as these two things have nothing to do with each other. It is also confusing having the same widget displayed in different places on different wikis. The correct place for anything associated with the user is the personal toolbar. The sidebar is for UX associated with the wiki and the article. The widget placement on Commons and MediaWiki.org is the correct placement and should be adopted on the other wikis as well.