English/Spanish message

Good morning. I am new using WordPress. I installed some hours ago in my GoDaddy hosting.

This is my first question please: I installed Spanish version of WP and a template called “page-style”. It is on my site: http://konexionrock.com, but messages appear in English and most of my visitors speak Spanish. For example, if I use Search option and there’s no results, it appears this message:

“Not Found
Sorry, but you are looking for something that isn’t here.”

I want to know where must I go to translate this into Spanish. ¿Is it possible?

Thanks…