first commit

_includes/lang.html

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+{% comment %}
+  Detect appearance language and return it through variable "lang"
+{% endcomment %}
+{% if site.data.locales[page.lang] %}
+  {% assign lang = page.lang %}
+{% elsif site.data.locales[site.lang] %}
+  {% assign lang = site.lang %}
+{% else %}
+  {% assign lang = 'en' %}
+{% endif %}