Content list menus translation
This can be changed on the Detection and selection page of the Language settings: /admin/config/regional/language/detection.
This page lists the detection methods, and by default, Drupal 8/9 prioritizes the path.
But, here you have two options.
Option 1: You can enable User (Follow the user's language preference) and then drag User above Path, which should give the admin pages in the admin language. This is simple, but the drawback to this approach is that users on the site will see content based on the language set in their account, not the site, which may not be what you want.
Option 2: You can enabled Account administration pages and then drag Account administration pages above Path.  This will create a new setting on the user account edit page to set the admin language, so you may have to check all the admin accounts and set the language appropriately.  This approach is more complex than the first, but limits the change to admin content only, which is probably what you want.