LanguageCommandController.php

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<?php
namespace TYPO3\CMS\Lang\Command;

class LanguageCommandController extends \TYPO3\CMS\Extbase\Mvc\Controller\CommandController {

    protected $packageManager;

    protected $signalSlotDispatcher;

    public function updateCommand($localesToUpdate = '') {
        $updateTranslationService = $this->objectManager->get('TYPO3\\CMS\\Lang\Service\\UpdateTranslationService');
        $languageRepository = $this->objectManager->get('TYPO3\\CMS\\Lang\\Domain\\Repository\\LanguageRepository');

        $locales = array();
        if (!empty($localesToUpdate)) {
            $locales = \TYPO3\CMS\Core\Utility\GeneralUtility::trimExplode(',', $localesToUpdate, TRUE);
        } else {
            $languages = $languageRepository->findSelected();
            foreach ($languages as $language) {
                $locales[] = $language->getLocale();
            }
        }
        $this->packageManager = $this->objectManager->get('TYPO3\\CMS\\Core\\Package\\PackageManager');
        $this->emitPackagesMayHaveChangedSignal();
        foreach ($this->packageManager->getAvailablePackages() as $package) {
            $updateTranslationService->updateTranslation($package->getPackageKey(), $locales);
        }
    }

    protected function emitPackagesMayHaveChangedSignal() {
        $this->signalSlotDispatcher->dispatch('PackageManagement', 'packagesMayHaveChanged');
    }
}