Resolver.php

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<?php
namespace Magento\Backend\Model\Locale;

class Resolver extends \Magento\Framework\Locale\Resolver
{
    protected $_session;

    protected $_localeManager;

    protected $_request;

    protected $_localeValidator;

    public function __construct(
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        $defaultLocalePath,
        $scopeType,
        \Magento\Backend\Model\Session $session,
        \Magento\Backend\Model\Locale\Manager $localeManager,
        \Magento\Framework\App\RequestInterface $request,
        \Magento\Framework\Validator\Locale $localeValidator,
        $locale = null
    ) {
        $this->_session = $session;
        $this->_localeManager = $localeManager;
        $this->_request = $request;
        $this->_localeValidator = $localeValidator;
        parent::__construct($scopeConfig, $defaultLocalePath, $scopeType, $locale);
    }

    public function setLocale($locale = null)
    {
        $forceLocale = $this->_request->getParam('locale', null);
        if (!$this->_localeValidator->isValid($forceLocale)) {
            $forceLocale = false;
        }

        $sessionLocale = $this->_session->getSessionLocale();
        $userLocale = $this->_localeManager->getUserInterfaceLocale();

        $localeCodes = array_filter([$forceLocale, $sessionLocale, $userLocale]);

        if (count($localeCodes)) {
            $locale = reset($localeCodes);
        }

        return parent::setLocale($locale);
    }
}