website and doc build

[Jean-Charles Malahieude]

In CG 12.5 Website build, I read

"create-weblinks-itexi.py creates a load of texi macros (of the order of 
1000) similar to:

    @macro manualStableGlossaryPdf
    @uref{../doc/v2.14/Documentation/music-glossary.pdf,Music glossary.pdf}
    @end macro.

It loads its languages from langdefs.py, and therefore outputs the 
following unhelpful warning:

langdefs.py: warning: lilypond-doc gettext domain not found. "

This same warning appears all along a "make doc" because the 
LYDOC_LOCALEDIR variable does not exist at this time. It is defined in
make/lilypond-vars.make at line 79
  export LYDOC_LOCALEDIR:= $(top-build-dir)/Documentation/po/out-www
but this directory will be created and fed long after.

I've tried to understand how and when the mo files for the "program" are 
built, in order to reproduce it for Documentation, and change 
LYDOC_LOCALEDIR to point to $(top-build-dir)/Documentation/po/out but 
with no success at all.

Thanks for any pointers,
Jean-Charles