Saves translated configuration data.
string $name: Configuration object name.
string $langcode: Language code.
array $data: Configuration data to be saved, that will be only the translated values.
public function saveTranslationData($name, $langcode, array $data) {
$locale_name = self::localeConfigName($langcode, $name);
$this->configStorage
->write($locale_name, $data);
}