Bug 7298: (follow-up) various QA fixes

Bug 7298: (follow-up) various QA fixes

- use Modern::Perl;
- GPL version
- tabs

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes QA script and all tests.

Testing notes:
- CSV header row is now translatable.
  Tested by updating the German po files and checking for the line.
- Tested that claiming for late serial issues still works as
  expected, as one file has been renamed. Filed 10931 for
  untranslatable CSV contents.
- Tested that claiming late orders still works:
  * Table searching and sorting
    Works nicely, but some columns could be split up for better
    searching and sorting:
      * Order date: 20/01/2013 (245 days)
      * Total cost:     10.00x1 = 10.00 Books
        => item type should be separate
      * Basket:  10 MPL
        => Library and basket number could be separate columns
  * Filters
     * Combined various filters, search results look correct.
  * Selecting order for claiming
      * Limiting by vendor makes it possible to check/uncheck all
      * With no vendor limit, entries for other vendors will be
        locked after the first checkbox is checked for one vendor
  * Exporting as CSV
     * Exported single line > CSV appears correct.
     * Exporting multiple lines > CSV appears correct.
     PROBLEM: Translated CSV don't work correctly, as line
     breaks are lost in the translation process.
     Needs to be fixed in a follow-up.
  * Sending serial claim email
     * No regressions found - there are some problems with the
       email contents noted on bug 7298.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>