Bug 23602: (follow-up) Correct terminology, add tooltip

Bug 23602: (follow-up) Correct terminology, add tooltip

This follow-up changes the use of "branch" to the Koha standard
"library." The patch also adds the use of a Bootstrap tooltip for
showing an item type's library limitations in the main table of item
types.

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

In the table of item types, find one with library limitations. Hovering
over the "# library limitations" test should trigger a Bootstrap-styled
tooltip showing the library name and code.

Signed-off-by: Maryse Simard <maryse.simard@inlibro.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>