Add lang attribute to html tag
MODIFY
website/src/_includes/layouts/base.njk
website/src/_includes/layouts/base.njk
<!doctype html>
-<html data-theme="light">
+<html data-theme="light" lang="en">
<head>
<title>{{ title }}</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">

Add lang attribute to html tag