hugo-theme-anubis2/layouts/partials/language-switcher.html

<ul class="language-select">
    {{ $pageLang := .Page.Lang}}
    {{ $translations := .AllTranslations }}
    {{ if not .IsTranslated }}
        {{ $translations = $.Site.Home.AllTranslations }}
    {{ end }}

    {{ range $translations }}
        {{ if eq .Lang $pageLang }}
            <li>{{ .Language.LanguageName }}</li>
        {{ else }}
            <li><a href="{{ .RelPermalink }}">{{ .Language.LanguageName }}</a></li>
        {{ end }}
    {{ end }}
</ul>