Deprecated: Hook login_headertitle

[beatricelucaci]

PHP Deprecated: Hook login_headertitle is deprecated since version 5.2.0! Use login_headertext instead. Usage of the title attribute on the login logo is not recommended for accessibility reasons. Use the link text instead.

This appears to be in includes/login-template.php on line 243

$login_header_title = apply_filters( ‘login_headertitle’, $login_header_title );

https://wordpress.org/support/topic/deprecated-hook-login_headertitle/