Figure out a way to get a real breadcrumb in the admin workspace and implement it.
Currently, there is not any notion of page / sub-page, so the breadcrumb is always showing something like : 'Home > Current page title'.
But we sometimes need a breadcrumb as follows: 'Home > sub-page title > current page title'.

For example, this way the configuration page of a site will show up with the following breadcrumb : 'Home > Websites management > Configuration of the site ...'