html[lang]: use `site.Language.Lang` when `languageCode` is not set.

Regis Philibert

03.53.2023 906d7bec021a01076abfb9de4109495b02356f55

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{{ define "header" }}{{ partial "page-header.html" . }}{{ end }}
{{ define "main" }}
    <article class="center cf pv5 measure-wide-l">
      <h1>
        This is not the page you were looking for
      </h1>
    </article>
{{ end }}