Set locale on properties file

I know it might sound a bit strange but im trying to build an application for deployment on 2 different countries and i want to change their locale permanently for all users in their server. What property should I set and where? Or can this be done on the user admin?

Thank you for replying to all I inquiries… I seem to post alot :confused:

Set the following in application-home/

cuba.availableLocales = English|en
cuba.localeSelectVisible = false