Page.php

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<?php
namespace Magento\Backend\Block;

class Page extends \Magento\Backend\Block\Template
{
    protected $_localeResolver;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Framework\Locale\ResolverInterface $localeResolver,
        array $data = []
    ) {
        parent::__construct($context, $data);
        $this->_localeResolver = $localeResolver;
    }

    protected function _construct()
    {
        parent::_construct();

        $this->pageConfig->addBodyClass($this->_request->getFullActionName('-'));
    }

    public function getLang()
    {
        if (!$this->hasData('lang')) {
            $this->setData('lang', substr($this->_localeResolver->getLocale(), 0, 2));
        }
        return $this->getData('lang');
    }

    public function isSingleStoreMode()
    {
        return $this->_storeManager->isSingleStoreMode();
    }
}