Locale.php

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<?php
namespace Magento\Framework\Validator;

use Magento\Framework\Setup\Lists;

class Locale
{
    protected $lists;

    public function __construct(Lists $lists)
    {
        $this->lists = $lists;
    }

    public function isValid($localeCode)
    {
        $isValid = true;
        $allowedLocaleCodes = array_keys($this->lists->getLocaleList());

        if (!$localeCode || !in_array($localeCode, $allowedLocaleCodes)) {
            $isValid = false;
        }

        return $isValid;
    }
}