If you want your messages displayed in a different language than that specified in the system-wide /etc/.login, add this line to your .login:

setenv LANG your_language

your_language is the first part of the locale name listed in Locale objects, source files, and charmaps—for example, Ja_JP in the locale name JA_JP.IBM-939. Currently, z/OS UNIX ships messages in English, Kanji and Simplified Chinese.