Bug 34378: Fix inconsistencies in Libraries page titles, breadcrumbs, and header

Bug 34378: Fix inconsistencies in Libraries page titles, breadcrumbs, and header

This patch makes changes to the libraries administration page so that
the page title, breadcrumbs, and page headings are more consistent with
each other.

To test, apply the patch and go to Administration -> Libraries.

- Click "New library"
- The page title, breadcrumb navigation, and page heading should all
  read "New library"
- Enter some details, save your new library, and then click the "Delete"
  button corresponding to your new library.
- On the deletion conformation page, the page title and breadcrumb
  navigation should match, "Confirm deletion of library 'X'"
- Edit a library. On the edit page, the page title, breadcrumb
  navigation, and page heading should match: "Modify library 'X'"

Signed-off-by: paul <paul.poulain@biblibre.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>