Bug 28149: Improve internationalization and formatting on background jobs page

Bug 28149: Improve internationalization and formatting on background jobs page

This patch adds some logic to the background jobs template in order to
make job status and job type translatable. Output of dates has been
changed to use the KohaDates plugin, using the "with_hours" flag.

This patch also modifies the page title and breadcrumbs so that if one
is viewing the details of a background job the page title and
breadcrumbs reflect this.

I've also added inclusion of the preferences search form in the header,
the default for administration pages which don't have their own search.

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

 - If there are no background jobs listed, submit at least one batch of
   bibliograhpic records and at least one batch of authorty records for
   modification (Tools -> Batch record modification).
   - In the table of background jobs, the status should be shown
     correctly. If you see it capitalized ("Finished") you're seeing the
     new string in the template which will be used for translation.
   - In the "Type" column, you should see either "Batch authority record
     modification" or "Batch bibliographic record modification"
   - In the "Queued," "Started," and "Ended" columns the date should be
     formatted according to your system's dateformat system preference,
     including the time.
  - View the details of a background job. The same changes to status and
    type should be seen on this page, as well as the date formatting of
    the date fields.
    - In the breadcrumbs, confirm that it shows a link to the
      background jobs page followed by "Details if job #X".

Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Signed-off-by: Joonas Kylmälä <joonas.kylmala@iki.fi>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>