public function hardTranslationSetMerge(Locale $locale, $from, $into)
    {
        foreach ($from as $translation) {
            $translationString = $translation->getTranslation();
            $original = $translation->getOriginal();
            $context = $translation->getContext();
            $merged = $this->addOrCreateString($into, $context, $original);
            $merged->setTranslation($translationString);

            // The following raises an array to string warning
            // $merged->setPluralTranslation($translation->getPluralTranslation());
        }
    }