Está en español?
Yes, choose Spanish from the Options menu. You can see available languages in the “More Information” -box above.
Unfortunately the translation is not complete, some dialog is not translated and remains in English. I seems there is a new Spanish translation group redoing the translation, but it is work in progress for now.
By the way, same question was asked 19 hours ago. You could read the old discussions before asking. There is also FAQ page in the Wiki.