Bug 1056196

Short description of problem:
When trying to publish a translated book using the non-default config takes the TOC entry name from the default Book_Info file, regardless of whether it's included or not.

Long description:
The Fedora Installation Guide and Fedora Installation Quick Start Guide share the same repository. When building, using the default publican.cfg config builds the full IG, and an alternate config - quickstart.cfg - builds the Quick Start Guide.

The quickstart.cfg config specifies the book's mainfile as Installation_Quick_Start_Guide.xml. This XML links (xi:include) Article_Info.xml containing book information such as its title.

Now, I want to publish the Czech translation of the Quick Start Guide to docs.fedoraproject.org, embedding the site's TOC (--embedtoc). The Article_Info.xml file is translated in cs-CZ/Article_Info.po, and the title string looks like this:
#. Tag: title
#, no-c-format
msgid "Installation Quick Start Guide"
msgstr "Stručná příručka instalace"

The Book_Info file, which is only included in the full Installation Guide and NOT in the Quick Start Guide, has the title string untranslated:
#. Tag: title
#, no-c-format
msgid "Installation Guide"
msgstr ""

When I attempt to publish the cs-CZ version of the Quick Start Guide, the book builds correctly and its title is translated, the string being taken from cs-CZ/Article_Info.po. However, the TOC entry ignores this and takes the title specified in cs-CZ/Book_Info.po, which is untranslated, and the TOC therefore displays the guide as "Installation Guide", instead of "Stručná příručka instalace". Translating the title string in cs-CZ/Book_Info.xml and building again changes this entry. (tried it on Publican 4.0 on Fedora 19; apparently Publican 2.8 does not display the TOC entry in the locally built file)

Version-Release number of selected component (if applicable):
publican-4.0.0-0.fc19
publican-2.8-4.fc18

How reproducible:
100%

Steps to Reproduce:
1. clone install-guide.git[1], checkout branch F20
2. publican build --publish --embedtoc --langs=cs-CZ --formats=html-single --config=quickstart.cfg
3. open publish/cs-CZ/Fedora/20/html-single/Installation_Quick_Start_Guide/index.html
4. on the top of the html file, check the table of contents entry

Actual results:
the TOC entry at the top of the file reads "Installation Guide" - the title string in cs-CZ/Book_Info.po. This file is not included anywhere in this variant of the guide. The actual book title as it shows on the title page is correctly taken from cs-CZ/Article_Info.po, only the TOC entry is wrong.

Expected results:
the TOC entry reads "Stručná příručka instalace" - the string that the title is translated to in cs-CZ/Article_Info.po

Additional info:
I'm reportig this for Publican 4, but the bug appears in Publican 2.8 as well. This is a big issue, because right now Publican 2.8 is necessary for publishing documents to docs.fedoraproject.org - newer Publican versions break the site.

[1] https://git.fedorahosted.org/cgit/docs/install-guide.git/