Add a label to the breadcrumbs and to the home link for accessibility purpose

This issue is about bringing two improvements to the breadcrumbs regarding accessibility:

• Give the breadcrumb list a label so that screen readers make it easy for the user to understand the role of the list (unless a dedicated HTML role exists or any recommended practice for breadcrumbs).
• Give the breadcrumbs home icon a label as well, so that it can be understood as a link to the home page, when using a screen reader.