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Steps to reproduce the issue

Multilingual site required. HTML language attribute will only get added for the default language and does not change on other langages.

Expected result

Eg:

<html lang="en-gb" dir="ltr">

Should become on french version of same page:

<html lang="fr-fr" dir="ltr">

but does not

Actual result

Eg:

<html lang="en-gb" dir="ltr">

remains

<html lang="en-gb" dir="ltr">

System information (as much as possible)

Joomla! 3.9.21
Tested in PHP 7.4

Additional comments

Can be fixed by changing index.php of template from:

<html lang="<?php echo $this->language; ?>" dir="<?php echo $this->direction; ?>">

to:

<html lang="<?php echo $_REQUEST['language'];?>" dir="<?= $this->direction ?>"