maxxdesign on "Polylang and CPT"

Ok solved by myself

The right code is below

add_filter('pll_get_post_types', 'my_pll_get_post_types');
function my_pll_get_post_types($types) {
return array_merge($types, array( 'udt_homepage_slider' => 'udt_homepage_slider', 'udt_homepage_secs' => 'udt_homepage_secs'));
}

I used the name in the previous array but the code works using the theme slug for the cpt