private function saveToCache($original, $translations)
    {
        $cacheKey = $this->getCacheKey($original);
        $cacheContent = $this->cache->fetch($cacheKey);
        if (is_array($cacheContent)) {
            $cacheContent[$original] = $translations;
        } else {
            $cacheContent = [$original => $translations];
        }

        $this->cache->save($cacheKey, $cacheContent);
    }