Format of locales.dat File Entries

You can edit the locales.dat file to change the default language or character set for a platform, or to add new associations between platform locale names and SAP language and character set names.

Each entry in the locales.dat file links a platform-specific locale definition to a SAP language and character set combination. Each entry has this format:
locale = platform_locale, syb_language, syb_charset 
For example, this entry specifies that the default locale uses us_english for the language and iso_1 for the character set:
locale = default, us_english, iso_1