// SelectLocaleDialog의 코드
localeRepository.updateLocaleChoice(lists[objId]).subscribe {
    if (!isLanguageInstalled()) requestLanguageInstall()
    else restartApp(context, LoadingActivity::class.java)
}
private fun isLanguageInstalled(): Boolean = splitInstallManager.installedLanguages.contains(localStore.language)

private fun requestLanguageInstall() {
    splitInstallManager.startInstall(
            SplitInstallRequest.newBuilder()
                .addLanguage(Locale(localStore.language))
                .build())
}