By default, mysqld produces error messages in English, but they can also be displayed in any of several other languages: Czech, Danish, Dutch, Estonian, French, German, Greek, Hungarian, Italian, Japanese, Korean, Norwegian, Norwegian-ny, Polish, Portuguese, Romanian, Russian, Slovak, Spanish, or Swedish.
You can select which language the server uses for error messages using the instructions in this section.
The language name should be specified in lowercase.
By default, the language files are located in the
directory under the MySQL base directory.
For information about changing the character set for error messages (rather than the language), see Section 9.1.6, “Character Set for Error Messages”.
You can change the content of the error messages produced by the server using the instructions in the MySQL Internals manual, available at MySQL Internals: Error Messages. If you do change the content of error messages, remember to repeat your changes after each upgrade to a newer version of MySQL.