Help message from po/Makefile

["Hans F. Nordhaug" <Hans.F.Nordhaug@hiMolde.no>]

Hi!

AFAICT there is no documentation on how to use po/Makefile. On
http://www.debian.org/devel/website/translating we can read about 
"make init-po" to create new templates in an empty po directory.
However, there is nothing about how to update the po files. I ended
up reading english/po/Makefile to discover that it's "make update-po".
(Maybe I should have guessed that?)

I suggest adding a help target in the Makefile and, if it doesn't
break the build process, make that the default target.

Regards,
Hans Nordhaug