Are these new strings for the FINAL?
// Untranslated!
$txt['install_settings_utf8'] = 'UTF-8 Character Set'; // Untranslated!
$txt['install_settings_utf8_title'] = 'Use UTF-8 as default character set'; // Untranslated!
$txt['install_settings_utf8_info'] = 'This feature lets both the database and the forum use an international character set, UTF-8. This can be useful when working with multiple langugages that use different character sets.';