Special characters are not encoded correctly when creating printable letters (PDF)

If you select some users with special characters like æ, å, ñ, ü or ø in their name and select "Create Printable Letters (PDF)", the name is printed like this "Ã...lice Ægdav".

It can be fixed by changing line 145 in CRM/Utils/PDF/Utils.php from
$dompdf->load_html( $html );
to
$dompdf->load_html( utf8_decode( $html ) );