Since they don't have a contract, we don't confirm them manually, we
wait for the invoice to be paid. So remove the button that allows the
confirmation, to reduce confusion.
<p>
This sponsorship is awaiting an <a href="/invoiceadmin/{{sponsor.invoice.pk}}/">invoice</a> to be paid.
</p>
+{%if not sponsor.level.instantbuy%}
+{%comment%}Instant buy sponsorships should never be manually confirmed{%endcomment%}
<p>
<b>Iff</b> there is a signed <i>and</i> countersigned contract available
for this sponsor, it can be confirmed before the invoice is paid.
<p>
<a class="btn btn-default" href="confirm/" onClick="return confirmConfirm()">Confirm sponsor</a>
</p>
+{%endif%}
{%else%}
{%comment%}Sponsor has no invoice{%endcomment%}
{%if sponsor.level.instantbuy%}