https://vote.wikimedia.org/wiki/Special:SecurePoll/vote/457 has a wrong interface language and page content language.
<html lang="en" dir="ltr" class="client-nojs"> <head> <meta charset="UTF-8" /> <title>Elezioni 2015 del Comitato per lo Stanziamento dei Fondi della Wikimedia Foundation - Wikimedia Vote Wiki</title> [...] <body class="mediawiki ltr sitedir-ltr ns--1 ns-special mw-special-SecurePoll page-Special_SecurePoll_vote_457 skin-vector action-view"> [...] <h1 id="firstHeading" class="firstHeading" lang="it">Elezioni 2015 del Comitato per lo Stanziamento dei Fondi della Wikimedia Foundation</h1>
The body is in Italian, but doesn't say so. Only the firstHeading is in correct language.
The sidebar and search bar also are in Italian (where translations are used) but don't say so:
<div class="portal" role="navigation" id='p-navigation' aria-labelledby='p-navigation-label'> <h3 id='p-navigation-label'>Navigazione</h3> <div class="body"> <ul> <li id="n-Wikimedia-Foundation-Elections-2015"><a href="//meta.wikimedia.org/wiki/Special:MyLanguage/Wikimedia_Foundation_elections_2015">Wikimedia Foundation Elections 2015</a></li> <li id="n-FDC-candidates"><a href="//meta.wikimedia.org/wiki/Special:MyLanguage/Wikimedia_Foundation_elections/FDC_elections/2015/Candidates">FDC candidates</a></li> <li id="n-FDC-Ombudsperson-candidates"><a href="//meta.wikimedia.org/wiki/Special:MyLanguage/Wikimedia_Foundation_elections/FDC_Ombudsperson_elections/2015/Candidates">FDC Ombudsperson candidates</a></li> <li id="n-Board-candidates"><a href="//meta.wikimedia.org/wiki/Special:MyLanguage/Wikimedia_Foundation_elections/Board_elections/2015/Candidates">Board candidates</a></li> </ul> </div> </div> <div class="portal" role="navigation" id='p-tb' aria-labelledby='p-tb-label'> <h3 id='p-tb-label'>Strumenti</h3> <div class="body"> <ul> <li id="t-specialpages"><a href="/wiki/Special:SpecialPages" title="Elenco di tutte le pagine speciali [q]" accesskey="q">Pagine speciali</a></li> <li id="t-print"><a href="/w/index.php?title=Special:SecurePoll/vote/457&printable=yes" rel="alternate" title="Versione stampabile di questa pagina [p]" accesskey="p">Printable version</a></li> </ul> </div> </div> </div> </div>
The rest of the interface and content is in English, hence the UniversalLanguageSelector personal tools trigger correctly says "English".
Steps to reproduce: unknown. I just clicked a banner on mediawiki.org and arrived to https://meta.wikimedia.org/wiki/Special:SecurePoll/vote/336?rdfrom=%2F%2Fwikimediafoundation.org%2Fw%2Findex.php%3Ftitle%3DUser%3AJalexander%2FFDCVoteAB-B%26redirect%3Dno (a userpage, really?!).
If I click https://vote.wikimedia.org/w/index.php?title=Special:SecurePoll/vote/457&uselang=nl , language is correct. After doing so, uls-previous-languages cookie contains %5B%22en%22%2C%22nl%22%5D but other than this there is no cookie with language information.