DMZ language file

[eluser]frist44[/eluser]
When you install DMZ, it requires that you put the datamapper_lang.php in the languages. The content of the file seems to resemble the form_validation_lang.php file.

By default, I noticed that my error messages are coming from the form_validation_lang.php, what is the use of the datamapper_lang.php ?

Is there a way to ensure that the messages are coming from datamapper_lang.php, otherwise, what is the point of having this file?