They should be back now.  I had been trusting that the version of
LocalSetttings.php in our git repository had all the lastest changed committed,
but it appears that it didn't.  I restored the original LocalSettings.php and
committed the changes and Identity and Happiness now seem to be working as
expected.  Closing this ticket.

Literature reviews are missing*. We had 2 (as far as I remember): Identity and
Happiness.

See the links at
http://acawiki.org/AcaWiki:Literature_Reviews
(ignore the 'requested' reviews)
and
http://acawiki.org/Special:BrowseData/Literature_Review

Tried links like this:
http://acawiki.org/Literature_Review:Identity
http://acawiki.org/index.php?title=Literature_Review:Happiness

as well as the links given on the Literature Reviews page (which don't use a
namespace):
http://acawiki.org/Identity
http://acawiki.org/Happiness