Bug 9075: Rename "type" to "material type" on staff XSLT detail and results

Bug 9075: Rename "type" to "material type" on staff XSLT detail and results

The label Material type better describes what the icon presents.
It is based on leader values of the MARC record.

Revised Test Plan
-----------------
1) Set the Staff system preference XSLTDetailsDisplay to
   'default' and save.
2) Set the Staff system preference XSLTResultsDisplay to
   'default' and save.
3) Click 'Search the catalog' tab in the search area.
4) Search for something
5) Look for a biblio that has 942$c set to some type.
   -- It should display "Type:"
   Or take a result and modify it to have a 942$c.
6) Look at the biblio details
   -- It should also display "Type:"
7) Apply the patch
8) Search for the same biblio again.
   -- It should display "Material type:" this time.
9) Look at the biblio details
   -- It should display "Material type:" this time.
10) Run the koha qa test tool.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Note: This is a simple string substitution.
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 4bdd8d9a69f72751f0429be5bc58afdd218a4bb0)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>