Service Catalog is multi-language so you just need to change the language of the browser to Spanish to show Service Catalog is that language.
1. Go to Settings > Advanced > Languages
2. Expand Languages
3. If Spanish is not in the list: Click on Add Languages > Add Spanish
4. Click on the 3 dots icon and click on Move to the top
5. Open a new tab for Service Catalog. Now it should be displayed in Spanish.