language changes

Hello im building a directory using Directory+ theme by AIT.
I have a couple areas that I was wondering if they could be changed to spanish. The search bar names need to be changed to spanish and the month in the date part of a post needs to be in spanish. Is there a way that I can make these changes? You can look at these areas at that I’m talking about at http://www.veterinarios066.mx/advent/

https://wordpress.org/plugins/wpadverts/