Oh goodness, @ApgFogp! I'm incredibly sorry I let this sit in my open queue for so long!! :'( It was absolutely not my intention to let so much time go by without responding and I deeply apologize. 
When I check your page and click on English, the search results are showing in English for me. Is this what you are referring to?
Hmm.. I see the content on the left is showing in French. At first I assumed this was because the info is coming from your store language, which I didn't think Multilanguage could override. However, I do notice that if I add a product to the cart that the product details page, cart confirmation, and checkout page are all in English. I would suggest reaching out to the app developer. They may have to make some adjustments to make sure the category filters from the store are translating properly. Everything else appears to be working correctly. 
