hgbook: fix warn "Don't know what gentext to create for xref to"

[Dongsheng Song]

Hello,

In rev a13813534ccd[1], I fixed the warn:

Don't know what gentext to create for xref to "informalfigure" or "mediaobject"

Now the xref is correct[2], and not display "???" anymore. I am glad that you
pull my changes[3]. Please let me know if you are interested.

[1] http://bitbucket.org/dongsheng/hgbook/changeset/a13813534ccd/
[2] http://code.google.com/p/i18n-zh/downloads/list?q=label:hgbook
[3] http://bitbucket.org/dongsheng/hgbook/

---
Dongsheng Song

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