Note the CSS could probably be improved to avoid duplication with other
button style definitions. However, that's fine because we're going to
change the style of the links soon.
For the same reason, I haven't bothered to style every single link the
way it was until now.
This partial was going to get too complex since in some places we've got
different texts, different URLs or different confirmation messages.
While we should probably try to be more consistent and that would make
the partial work in most cases, there'll always be some exceptions, and
using a partial (with, perhaps, some helper methods) will become messy
really quickly.
Originally, the code was shared between the index action and the search
action, but since commit fb6dbdf2 that's no longer the case. So in the
index action we don't need to check whether a user is a
moderator/manager/admin/official or not; they all are.
