I can't think of a way to only install the ./configured manpages when doing
make install but have every page in the make dist using the standard *_MANS
variables, so I've did it manually, it seems to works correctly
Added Makefile.am in doc/man which supports multilanguage man pages
install/uninstall.
If there is a new man page language available create a subdir named after the lang and append it's name to MAN_LANG here.