Make previous commit actually work

This is a huge mess, Zola is really not i18n-friendly

templates/partials/language_switcher.html

@@ -1,12 +0,0 @@
-{% if config.extra.language_switcher %}
-  <div class="lang" aria-label="{{ trans(key="language", lang=lang) }}">
-    {% set language_agnostic_path = current_path | default(value="/") | replace(from='/' ~ lang ~ '/', to = '/') | trim_start_matches(pat = '/') %}
-    {% for tr in config.extra.translations %}
-      {% if tr.code == lang %}
-        <span class="active">{{ tr.name }}</span>
-      {% else %}
-        <a href="{{ get_url(path=language_agnostic_path, lang=tr.code) ~ "/" }}" hreflang="{{ tr.code }}" lang="{{ tr.code }}">{{ tr.name }}</a>
-      {% endif %}
-    {% endfor %}
-  </div>
-{% endif %}