When setting up Localization and implementing multiple languages within Identity Manager you may have a need to configure translating a 4 letter language code (i.e. zh-tw).
So how do you translate each of the resource bundle property files with a 4 letter Language code dictionary file?
The Java convention for locale is that a browser language that's represented by xx-yy is represented in java by xx_yy (the dash turns into an underscore).
This entire mechanism is case sensitive.
The resource bundles file that's being picked is: