Howto create a Language (enviroment) variable

[Richard]

The simplest way to tackle this:

• Create an Environment action in the logon sequence for each language(group), create a variable (e.g. LANGUAGE) and set it to 'nl-NL' or one of the others.
  
• Make sure the environment variable is propagated
  
• Make sure this action only executes if the user is a member of the corresponding XA_ group, so set a condition on this action that tests for the correct groupmembership
  

So, in your example you could add 3 Environment actions (one for each language group) and set the LANGUAGE environment variable accordingly.
At next logon %LANGUAGE% will resolve to one of the IETF strings.

Cheers,
Richard