Manager.php

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

class Manager
{
    protected $_session;

    protected $_authSession;

    protected $_translator;

    protected $_backendConfig;

    public function __construct(
        \Magento\Backend\Model\Session $session,
        \Magento\Backend\Model\Auth\Session $authSession,
        \Magento\Framework\TranslateInterface $translator,
        \Magento\Backend\App\ConfigInterface $backendConfig
    ) {
        $this->_session = $session;
        $this->_authSession = $authSession;
        $this->_translator = $translator;
        $this->_backendConfig = $backendConfig;
    }

    public function switchBackendInterfaceLocale($localeCode)
    {
        $this->_session->setSessionLocale(null);

        $this->_authSession->getUser()->setInterfaceLocale($localeCode);

        $this->_translator->setLocale($localeCode)->loadData(null, true);

        return $this;
    }

    public function getGeneralLocale()
    {
        return $this->_backendConfig->getValue('general/locale/code');
    }

    public function getUserInterfaceLocale()
    {
        $userData = $this->_authSession->getUser();
        $interfaceLocale = \Magento\Framework\Locale\Resolver::DEFAULT_LOCALE;

        if ($userData && $userData->getInterfaceLocale()) {
            $interfaceLocale = $userData->getInterfaceLocale();
        } elseif ($this->getGeneralLocale()) {
            $interfaceLocale = $this->getGeneralLocale();
        }

        return $interfaceLocale;
    }
}