[doc] Default locale for documentation: en or C

[Chuck Hagenbuch]

Hi folks-

Right now, as you may have noticed if you're on the CVS list, I'm  
working on revamping/reviving our docbook documentation (in CVS in the  
hordedoc/ module - http://cvs.horde.org/hordedoc/).

I've converted most of the infrastructure over to docbook-xsl, which  
provides a much simpler tool chain than the docbook-dsssl and sgml  
tools previously did. And it's currently set up to be able to build  
the dev manual in various languages, albeit one at a time.

Current small question: should the default documentation be in the  
"en" directory, for english, or should it be in "C", for the default  
system locale?

Help working on this would be _very_ welcome. Please take a look at  
the makefile, help me make it more elegant and flexible for building  
multiple books and languages (perhaps even all at once, at least if  
you ask it to), combining books into custom manuals (I want an admin +  
developer manual for only IMP), etc. Tell me things I got wrong on the  
docbook or makefile side, I'm sure there's plenty of it.

Thanks!

-chuck