Bug 23884: Merge strings.inc and browser-strings.inc

Bug 23884: Merge strings.inc and browser-strings.inc

This patch take the contents of the JavaScript in browser-strings.inc
and puts it in strings.inc. browser-strings.inc is deleted.

To test, apply the patch and perform a catalog search in the staff
client.

 - View any result. In the left-hand sidebar there should be a search
   results browser box with "previous" and "next" arrows and a link back
   to search results.
 - Click on each different "view" tab and confirm that the search
   results navigation box persists: Normal, MARC, Labeled MARC, ISBD,
   Items.
 - From any of these views select Edit -> Edit items. The same
   navigation box should appear.

Note: addbiblio.tt and stockrotation.tt are modified but feature doesn't
currently work on those pages.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>