Add Unshipped Languages in Siebel applications
Language codes used by Siebel applications use a three-letter code, such as ENU. Using language codes with only two characters does not work and is not supported.
These codes follow conventions where the first two letters represent a two-letter language code from ISO Standard 639, and the third letter differentiates the main country where this language is used. Multiple entries can represent different countries that use variants of the same language (for example, PTG for Portuguese - Portugal, and PTB for Portuguese - Brazil).