Bug 10235: Add DataTables filters on local use prefs

Bug 10235: Add DataTables filters on local use prefs

There is no way to search for local use prefs.
This patch provides an easy way to search for pref present in
of local use prefs table.

Test plan:
1/ Go on the system preferences administration page
2/ Click on the Local Use table
3/ Confirm you are able to filter the table by pref name or description
using the DataTables filters on top of it.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
NOTE: Local use tab is distinct from other tabs, so implementing
      'Search system preferences' across all tabs would be very
      difficult. This patch adds a filter to the Local Use tab,
      which nicely allows for filtering, as per Owen's suggestion
      in comment #1.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>