So what exactly should be avoided? FlaggedRevs has
some messages
that appear on
most pageviews and transclude other messages (such as
http://translatewiki.net/wiki/MediaWiki:Revreview-quick-none/en ),
ouch.
should those
be substituted in too?
yes.
What about constructs like {{PLURAL}} which don't
require
pulling the content of another message?
same.