Library /sys$common/syshlp/dbg$help.hlb DEBUG, Built in Symbols, %LANGUAGE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Specifies the current language. The current language is the
    language last established with the SET LANGUAGE command. BY
    default, if you did not enter a SET LANGUAGE command, the current
    language is the language of the module containing the main
    program (image transfer address).

    Example:

    DBG> EVALUATE %LANGUAGE
    'FORTRAN'
    DBG> SET LANGUAGE ADA
    DBG> EVALUATE %LANGUAGE
    "ADA"