Polylang Header Slider Text

Hello, I want to make my webpage multilingual and I’m in a little trouble. I want to change the text of the slider in the home page, one diferent phrase for every language the web has, but I don’t know how to do it. I asume I must change a php file but I don’t know which one nor what I must change in it.

Any help you could bring to me would be much apreciate. Thanks in advance.

These is my web: http://sagresamba.esy.es/