<!DOCTYPE html>
<html lang="zh">

  {% include head.html %}

  <body>

    {% include header.html %}

    {% unless page.toc %}

    {% include main.html %}

    {% else%}

    {% include postmain.html %}

    {% endunless %}

    {% include footer.html %}

    {% include script.html %}

    {% if site.google_analytics %}
      <script type="text/javascript">
        (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
        (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
        m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
        })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
        ga('create', '{{ site.google_analytics }}', 'auto');
        ga('send', 'pageview');
      </script>
    {% endif %}

  </body>

</html>

<!DOCTYPE html>
<html lang="en">

  {% include head.html %}

  <body>

    {% include header.html %}

    {% unless page.toc %}

    {% include main.html %}

    {% else%}

    {% include postmain.html %}

    {% endunless %}

    {% include footer.html %}

    {% include script.html %}

    {% if site.google_analytics %}
      <script type="text/javascript">
        (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
        (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
        m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
        })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
        ga('create', '{{ site.google_analytics }}', 'auto');
        ga('send', 'pageview');
      </script>
    {% endif %}

  </body>

</html>

Change language from "zh" to "en"
Change language from "zh" to "en"