@Angel: There is 2 issues in here. I cannot look at our site when it’s in local version. Second, we cannot worked much in Polylang plugin. I just know that it work fine with our latest version of Catch Kathmandu Pro if you add that flag in Widgets. Also we added this after one of our user requested to add it. Add in menu is high level of customization, hope you have done through child theme.
So, please add this site live in your testing server and I can check in.