getTranslationReader example

$keys = $eventManager->filter(
                    'TemplateMail_CreateMail_Available_Theme_Config',
                    $this->themeVariables,
                    ['theme' => $theme]
                );

                $theme = array_intersect_key($theme, $keys);
                $defaultContext['theme'] = $theme;
            }

            $isoCode = $this->getShop()->getId();
            $translationReader = $this->getTranslationReader();

            if ($fallback = $this->getShop()->getFallback()) {
                $translation = $translationReader->readWithFallback($isoCode, $fallback->getId(), 'config_mails', $mailModel->getId());
            } else {
                $translation = $translationReader->read($isoCode, 'config_mails', $mailModel->getId());
            }

            $mailModel->setTranslation($translation);
        } else {
            $defaultContext = [
                'sConfig' => $config,
            ];