Hi Benjamín,
Our internationalization features aren't very good at the moment. I'm afraid there's no option to change the default button text on slider questions.
There is a workaround for the specific case you mentioned – you could use an explicit *page
keyword and make sure you end that page with a *button
. You're free to use whatever text in whatever language for the button, and it'll look like a slider question:
*page
*question: How are you feeling?
*type: slider
*button: Move on to the next page
In your case, you'd use Spanish for the question text and button.