Bug 14263: Fix export of item search results when translated

Bug 14263: Fix export of item search results when translated

This csv does not use the correct way to display headers.
They should be put in a separate file to get a correct display.
Without this patch, the first line of the generated file contains the
headers + data

Test plan:
1/ choose a language and update + translate the templates
for instance:
  cd misc/translate;
  ./translate update es-ES; ./translate install es-ES
2/ Go to the item search form using this language
3/ Launch a search and select CSV to display the results.
The CSV headers should be correct

Signed-off-by: Frederic Demians <f.demians@tamil.fr>
  Seen the bug. Works as described.

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