It seems that there is no way for me to show a different slider with a different language website using PolyLang. I have tried the link you have provided before by activating “Custom post types and Taxonomies” in the settings. It does not do anything for Serious Slider.
I just want to show a french button linking to a french part of the site.
Teele, to do that use the theme’s slider shortcode functionality combined with Polylang – this way you have two slider shortcode input fields in Polylang’s strings management screen.