LPS-42184 Improve feedback for localized errors

Hey Brian,

I have added one last commit to make it clear that LocalizedException is the object and when you do LocalizedException.getLocalizedExceptionsMap you are getting a map of Locale, Exception.

This comes from https://github.com/brianchandotcom/liferay-portal/pull/15326#issuecomment-28410386

Thx!