Hierarchy details:
Specifically, the local man pages is in
/usr/local/share/man/man[1-8]
If there is man pages in other language than English, say de, then:
/usr/local/share/man/de
Changing the LANG will search for man pages in different language. Example:
(when LANG is not set, use default system locale)
$ man -w dvipdf
/usr/local/share/man/man1/dvipdf.1
(Change to de)
$ export LANG=de
$ man -w dvipdf
/usr/local/share/man/de/man1/dvipdf.1