Bug 12072: Make datepicker and templates to be aware of dmydot format

Bug 12072: Make datepicker and templates to be aware of dmydot format

This patch is to display corrextly the new dmydot date format e.g. after
using the datepicker or in messages for the user, in following files:

- koha-tmpl/intranet-tmpl/prog/en/includes/calendar.inc
- koha-tmpl/intranet-tmpl/prog/en/includes/date-format.inc
- koha-tmpl/intranet-tmpl/prog/en/includes/patron-search.inc
- koha-tmpl/intranet-tmpl/prog/en/modules/tools/holidays.tt
- koha-tmpl/opac-tmpl/bootstrap/en/includes/calendar.inc
- tools/holidays.pl

To test:
- Apply patch
- Make sure that you have syspref dateformat set to dmydot
- Use datepicker in OPAC (modify birth date), verify that after
  choosing a date, it is displayed correctly in the datepicker
- Use datepicker at several places in OPAC, verify that after choosing
  a date the date displays properly in datepicker and that the dater format
  is properly indicated (e.g. near birth date or near "Specify due date").
- Verify that datepicker works well with hoiday editing and that "From date:"
  displays properly

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