Hello, @Jubaer,
1.. Actually for the footer image issue I have already replied to you on another topic of yours “333234” please check our response on it.
2.. To configure the Polylang plugin please read this article to understand how you can set up the plugins and use it on your site: https://polylang.pro/doc/installation/
3.. Here is the image of your site category page it is working just fine: https://postimg.cc/gLDwg5zC and here is the resulting image of the product page: https://postimg.cc/CRZGKhLd both are working fine there is no issue please check back to your site after clearing the browser cache.
Regards 8Themes Team.