hugo-theme-terminal/layouts/partials/mobile-menu.html

{{ $currentpage := .Page }}
<ul class="menu menu--mobile">
  <li class="menu__trigger">Menu&nbsp;▾</li>
  <li>
    <ul class="menu__dropdown">
      {{ range $.Site.Menus.main }}
        {{ if not .HasChildren }}
          <li><a href="{{ .URL }}">{{ .Name }}</a></li>
        {{ end }}
      {{ end }}
      {{ if and $.Site.Params.showLanguageSelector (len $.Site.Home.AllTranslations) }}
        <hr />
        {{ range $.Site.Home.AllTranslations }}
        {{ if ne .Lang $currentpage.Language.Lang }}
        {{ if eq .Lang $.Site.Params.DefaultContentLanguage }}
        <li><a href="{{ strings.Substr $currentpage.RelPermalink 3 }}">{{ .Language.LanguageName }}</a></li>
        {{ else }}
          {{ if eq $currentpage.Language.Lang $.Site.Params.DefaultContentLanguage }}
          <li><a href="/{{ .Lang }}{{ $currentpage.RelPermalink }}">{{ .Language.LanguageName }}</a></li>
          {{ else }}
          <li><a href="/{{ .Lang }}{{ substr $currentpage.RelPermalink 3 }}">{{ .Language.LanguageName }}</a></li>
          {{ end }}
        {{ end }}
        {{ end }}
        {{ end }}

      {{ end }}
    </ul>
  </li>
</ul>