{% capture firebase-lang %}
  {{ site.lang | slice: 0,2 | default: "en" }}
{% endcapture %}
{% assign firebase-lang = firebase-lang | strip %}
{% if firebase-lang == "es" %}
  {% assign firebase-lang = "es_419" %}
{% elsif firebase-lang == "pt" %}
  {% assign firebase-lang = "pt_br" %}
{% endif %}

<link type="text/css" rel="stylesheet" href="https://www.gstatic.com/firebasejs/ui/3.6.1/firebase-ui-auth.css" />
<script src="https://www.gstatic.com/firebasejs/ui/3.6.1/firebase-ui-auth__{{ firebase-lang }}.js"></script>
<script type="text/javascript">
  {% include components/firebase/ui.js %}
</script>