PreProcessor.php

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

use Magento\Framework\App\AreaList;
use Magento\Framework\TranslateInterface;
use Magento\Framework\View\Asset\File\FallbackContext;
use Magento\Framework\View\Asset\PreProcessor\Chain;
use Magento\Framework\View\Asset\PreProcessorInterface;

class PreProcessor implements PreProcessorInterface
{
    protected $config;

    protected $areaList;

    protected $translate;

    public function __construct(Config $config, AreaList $areaList, TranslateInterface $translate)
    {
        $this->config = $config;
        $this->areaList = $areaList;
        $this->translate = $translate;
    }

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

            $areaCode = \Magento\Backend\App\Area\FrontNameResolver::AREA_CODE;

            if ($context instanceof FallbackContext) {
                $areaCode = $context->getAreaCode();
                $this->translate->setLocale($context->getLocale());
            }

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

            $chain->setContent($this->translate($chain->getContent()));
        }
    }

    public function translate($content)
    {
        foreach ($this->config->getPatterns() as $pattern) {
            $content = preg_replace_callback($pattern, [$this, 'replaceCallback'], $content);
        }
        return $content;
    }

    protected function replaceCallback($matches)
    {
        return '"' . __($matches[1]) . '"';
    }
}