that will add
lang="ur" attribute in page's main
<body> tag. How I can do that? I try different plugin including polylang, but look not working. Please suggest plugin if you know or do some simple coding.
You can create a custom field, give it a value of lang='ur' and check for it in your header.php.
Each page you want to show this lang, you just select the 'page_lang' custom field and give it the value you want (you have the option to write any value you want, thus any other language than 'ur').