Add a standard date format for each locale

In the template ${myDate.format()} is dependent of the locale

In case of a query, the date parameters are also dependent of the locale.
ie /documents/?fromDate=01-12-2009

We need to add a way to configure that.

Add the following properties in the application.conf file.

date.format=
data.format.fr=

Note that this date format can also be used for the following url (REST resource):

/documents/11-11-2009/ only if no date format was specified for the binding (but that is another issue).

This issue is linked to the issue #446302

More info here http://groups.google.com/group/play-framework/browse_thread/thread/cb81fb4941a66e52