InfoLanguageListCommand.php

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<?php
namespace Magento\Setup\Console\Command;

use Magento\Framework\App\ObjectManager;
use Magento\Framework\Setup\Lists;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Helper\TableFactory;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class InfoLanguageListCommand extends Command
{
    private $lists;

    private $tableHelperFactory;

    public function __construct(Lists $lists, TableFactory $tableHelperFactory = null)
    {
        $this->lists = $lists;
        $this->tableHelperFactory = $tableHelperFactory ?: ObjectManager::getInstance()->create(TableFactory::class);
        parent::__construct();
    }

    protected function configure()
    {
        $this->setName('info:language:list')
            ->setDescription('Displays the list of available language locales');

        parent::configure();
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $tableHelper = $this->tableHelperFactory->create(['output' => $output]);
        $tableHelper->setHeaders(['Language', 'Code']);

        foreach ($this->lists->getLocaleList() as $key => $locale) {
            $tableHelper->addRow([$locale, $key]);
        }

        $tableHelper->render();
        return \Magento\Framework\Console\Cli::RETURN_SUCCESS;
    }
}