Bug 22935: Improve style of Bootstrap pagination

Bug 22935: Improve style of Bootstrap pagination

This patch makes some updates to the staff client CSS and adds Font
Awesome icons to the Bootstrap pagination include.

To test, apply the patch and rebuild the staff client CSS.

Perform a search in the staff client which will return multiple pages of
results. Check that the pagination links look good.

Signed-off-by: Maryse Simard <maryse.simard@inlibro.com>
Signed-off-by: Bin Wen <bin.wen@inlibro.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 33b70b798d4cc2bc6d6db43a40d006dd8c1109b8)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>