Access display keys with DisplayKey.get

The use of displaykey.* to refer to display keys in Gosu, PCF, and other configuration files is no longer valid.

To refer to display keys, use the method DisplayKey.get. For example:

Old reference	New reference
displaykey.Web.Address.Default.PostalCode	DisplayKey.get("Web.Address.Default.PostalCode")

You must include the following uses statement in any Gosu program that calls DisplayKey.get:

uses gw.api.locale.DisplayKey