ok_locales and ok_language purpose

[Johnson, Robert F]

What is the purpose of the ok_languages and ok_locales configurations? 

I read the POD doc but I am still a bit confused.  For example, if
Japanese was included in either ok_locales or ok_languages, does that
mean that they would be evaluated for spam or ignored?  Is it possible
to use either of these configuration setting to tell Spam Assassin to
ignore Japanese email (to avoid any false positive risk)?