(bug 42467) Replace "Zarro Boogs found" in Bugzilla by "Zero reports found"

This is a simply one-line string replacement
that is marked as WONTFIX upstream in https://bugzilla.mozilla.org/show_bug.cgi?id=313647.
Still it requires copying template/en/default/global/variables.none.tmpl
to template/en/custom/global/variables.none.tmpl before changing that line,
hence this looks bigger than it is.

Change-Id: I9195853b89d34765610fac2aa302afe0344eecee
Merge "(bug 42467) Replace "Zarro Boogs found" in Bugzilla by "Zero reports found""