'make todo' in po/ directories

[Martin Quinson <martin.quinson@tuxfamily.org>]

[Please CC me, I'm not on this list anymore]

Hello,

I added a new target in the po/Makefile called 'todo'. It extracts the
untranslated strings from the existing po files, which is very usefull to
ask help for the parts you failed to translate yourself.

At least, I like it and wanted other people to hear about it. ;)

Bye, Mt.

-- 
Or, bien souvent, les matières scientifiques ne se discutent pas. Il y a une
logique d'acquisition des savoirs qui nécessitent plus de « par coeur » que
de créativité.
          --- Luc Ferry, Ministre français de l'éducation nationale.