<!DOCTYPE html>
<html>
  <head>
    {% include head.html %}
  </head>
  <body>
    {% include header.html %}
    <main>
      {{ content }}
    </main>
    {% include footer.html %}
  </body>
</html>

<!DOCTYPE html>
<html lang="ru">
  <head>
    {% include head.html %}
  </head>
  <body>
    {% include header.html %}
    <main>
      {{ content }}
    </main>
    {% include footer.html %}
  </body>
</html>

Add lang attribute to html tag
Add lang attribute to html tag
