hugo-theme-readable/layouts/partials/header.html

<h1>{{ $.Site.Title }}</h1>
<p>{{ $.Site.Params.subtitle }}</p>

<nav>
  {{ range .Site.Menus.main -}}
  <span>
      <a href="{{ .URL | absLangURL }}">{{ .Name }}</a>
  </span>
  {{- end }}
</nav>