PreProcessor.php

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<?php
namespace Magento\Translation\Model\Json;

use Magento\Framework\App\AreaList;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\TranslateInterface;
use Magento\Framework\View\Asset\File\FallbackContext;
use Magento\Framework\View\Asset\PreProcessor\Chain;
use Magento\Framework\View\Asset\PreProcessorInterface;
use Magento\Framework\View\DesignInterface;
use Magento\Translation\Model\Js\Config;
use Magento\Translation\Model\Js\DataProviderInterface;

class PreProcessor implements PreProcessorInterface
{
    protected $config;

    protected $dataProvider;

    protected $areaList;

    protected $translate;

    private $viewDesign;

    public function __construct(
        Config $config,
        DataProviderInterface $dataProvider,
        AreaList $areaList,
        TranslateInterface $translate,
        DesignInterface $viewDesign = null
    ) {
        $this->config = $config;
        $this->dataProvider = $dataProvider;
        $this->areaList = $areaList;
        $this->translate = $translate;
        $this->viewDesign = $viewDesign ?? ObjectManager::getInstance()->get(DesignInterface::class);
    }

    public function process(Chain $chain)
    {
        if ($this->isDictionaryPath($chain->getTargetAssetPath())) {
            $context = $chain->getAsset()->getContext();

            $themePath = '*/*';
            $areaCode = \Magento\Backend\App\Area\FrontNameResolver::AREA_CODE;

            if ($context instanceof FallbackContext) {
                $themePath = $context->getThemePath();
                $areaCode = $context->getAreaCode();

                $this->viewDesign->setDesignTheme($themePath, $areaCode);
            }

            $area = $this->areaList->getArea($areaCode);
            $area->load(\Magento\Framework\App\Area::PART_TRANSLATE);

            $this->translate->setLocale($context->getLocale())->loadData($areaCode, true);

            $chain->setContent(json_encode($this->dataProvider->getData($themePath)));
            $chain->setContentType('json');
        }
    }

    protected function isDictionaryPath($path)
    {
        return (strpos($path, $this->config->getDictionaryFileName()) !== false);
    }
}