To enable your CICS® region to use the message load module generated by the message editing utility, you must:
If you modify messages using language code A (for alternative ENGLISH) you should specify NATLANG=A (or NATLANG=(A,E) to ensure your modified message tables are used as the default tables in place of the standard English versions. NATLANG=A is equivalent to NATLANG=(A,E). Do not specify (E,A).
If you translate messages using S (for Spanish) and F (for French) and you want French to be the default language with Spanish and English used selectively (by terminal or userid), specify NATLANG=(F,S) or NATLANG=(F,S,E). In this example, if NATLANG is not specified on terminals or userids, French is taken as the default language.