Bug 15373: More changes of Zip to ZIP on intranet

Bug 15373: More changes of Zip to ZIP on intranet

To test:

- Log in to Staff Interface, go to Administration, Libraries and Groups (cgi-bin/koha/admin/branches.pl). Click 'New library' and confirm that it says 'ZIP/Postal Code:' in the form.
- Go back to Administration, Cities and towns (cgi-bin/koha/admin/cities.pl). Confirm it says 'ZIP/Postal code' in table heading. Click 'New city' and confirm it says 'ZIP/Postal code:' in form
- Go back to Administration, Global system preferences, I18L/L10N (cgi-bin/koha/admin/preferences.pl?tab=i18n_l10n). Under AddressFormat, confirm all available options say '[ZIP/Postal Code]'
- Go to Reports, Patrons (cgi-bin/koha/reports/borrowers_stats.pl). Confirm it says 'ZIP/Postal code' under Title
- Go to Tools, Batch patron modification (cgi-bin/koha/tools/modborrowers.pl), enter any card number and click 'Continue'. Confirm it says 'ZIP/Postal code' in the table of patron details, and in the form to edit

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
NOTE: Tested together with first patch.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>