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In Drupal 7, PHP-file based quick string overrides were located in the global
$conf['locale_custom_strings_' . $langcode] array. In Drupal 8, the $conf array is used for global config() overrides only, so this was moved out to global
$settings['locale_custom_strings_' . $langcode]. It can still be set from settings.php.
The structure of the array did not change.
This change only affects you if you use the
$conf['locale_custom_strings_' . $langcode] overrides in your settings.php before.