If this is a page list being filtered by a topic, the multilingual switcher isn’t going to carry the filtration over because multilingual just maps pages to pages. Including the topic is actually a method being applied to the page.
That said, in your situation, I would recommend creating a page specifically for the filtered page list, if it is very important for people to land on it from a navigation link. That way multilingual would work well, and you could just make your page structure map to the different topics. This would be good for SEO as well.
Finally I would recommend enabling pagination for your page lists - setting them to just load everything makes page load times very long.
I Evan , thank you for your reply, for first i’m not first developer of this web site, and so i don’t know very well what have done the first developer
