How do I change the date format for screens to be dd/MM/yy ?

I would like to change the date format for display on the user interface screens for ORPOS.
Oracle Retail Point of Service has provided a means of controlling locale behaviour by changing the following properties in application.properties

locale_Default=en_ZA
locale_Journaling=en_ZA
locale_Receipts=en_ZA
locale_PoleDisplay=en_ZA
locale_Reports=en_ZA
locale_Devices=en_ZA

However, this locale (en_ZA) gives me the date format of yy/MM/dd which our users do not like.

I have seen that using a locale like en_GB gives the date format of dd/MM/yy.