lang-switch.html

{{ $page := . }}
{{ $siteLang := "" }}
{{ $url := "" }}
{{ with site.Languages }}
  <ul>
    {{ range site.Languages }}
      {{/*  .Lang  */}}
      {{ $siteLang := . }}
      {{ $url = printf "/%s/" .Lang }}
      {{ range $page.Translations }}
        {{ if eq .Lang $siteLang.Lang }}
          {{ $url = .Permalink }}
        {{ end }}
      {{ end }}
      <li><a href="{{ $url }}">{{ $siteLang.LanguageName }}</a></li>
    {{ end }}
  </ul>
{{ end }}