Date picker not working for certain languages (Bug #1376997)

Allowing other language's date formats to be used - eg German dates
like 10.05.2013

As the datepicker uses yet another format for parsing dates we need to
add in some new strings to handle this.

Note - lang strings will need to be added to the langconfig.php file
for the languages you are testing, eg:

$string['calendar_dateFormat'] = 'dd.mm.yy';
$string['calendar_timeFormat'] = 'HH:mm';

Change-Id: I40e7c50687d9e42d0f78df450fff0004dd6d5710
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>
Merge "Date picker not working for certain languages (Bug #1376997)"