[Resuelto] translation text

Background of the issue:
I am trying to translate words from English to Arabic inside a carousel. The issue can be seen on this page: enlace oculto. I expected to see a slider of authors on the home page in Arabic here: enlace oculto and in English when the website is in English.

Symptoms:
Instead of seeing the slider in Arabic, I got the English slider when the website is in Arabic.

Questions:
Why is the carousel not displaying the translated Arabic text?
How can I ensure the slider shows the correct language based on the website's language setting?