build gnome-user-docs with nl included

[Hannie Dumoleyn <lafeber-dumoleyn2 zonnet nl>]

Op 26-02-18 om 13:01 schreef Andre Klapper:
> Hi,
>
> On Mon, 2018-02-26 at 11:15 +0100, Hannie Dumoleyn wrote:
> > After having finished gnome-user-docs 3.28 Dutch translation I want
> > to check it. Can I open a .po file using Yelp?
> That won't work - Yelp displays help pages, not translation files. :)
>
> https://mail.gnome.org/archives/gnome-doc-list/2014-September/msg00075.html
> explains how to build help files. (Crossing fingers it's still valid.)
>
> andre

What I have done is this:

Pre-commit checks instructions on [1]: I have built gnome-user-docs 
according to these instructions. What I get in the folder 
system-admin-guide is C, cs, de, es, gl and ko.

My question is: why do I only get 5 languages in this build, while I do 
have /nl in /gnome-user-docs/gnome-help. Should I add nl somewhere 
(Makefile, Makefile.am or whatever)?

Hannie
P.s.: I tried to chat, but nobody was active in #docs

[1] https://wiki.gnome.org/DocumentationProject/Tasks/DesktopHelp