You said, "Now are 1.9.4, upgrade from 1.8.2 and traslate to spanish with language pack"1.9.4 has not been released yet. It's currently in RC (Release Candidate) status and rc4 was just released. You should not be running a RC (Beta) in a production environment. You should restore from back up to 1.8.2, and upgrade to 1.9.3 if you want to upgrade.Failing that, you should disable the language pack and revert to English and see if you are still experiencing the same error. The language feature is not complete, and the language files are definitely not ready for production use.