Steps to reproduce the issue

Have a user confirm acceptance of the Privacy Policy on login (Enable the System - Privacy Consent plugin)
Go to the administrator Privacy / Consents page.

Expected result

The Subject should be a translated string: Privacy Policy

Actual result

The Subject is a string key: PLG_SYSTEM_PRIVACYCONSENT_SUBJECT

System information (as much as possible)

Additional comments

I have traced this problem to plugins/system/privacyconsent/src/Extension/PrivacyConsent.php where the following block of code is missing from line 39 and following:

    /**
     * Load the language file on instantiation.
     *
     * @var    boolean
     * @since  3.9.0
     */
    protected $autoloadLanguage = true;

It was present in Joomla 4.