fix(templates): each delete page says what deleting its object does

The shared delete page asked only whether to delete the object. Each
view now gives its consequence: a deleted compute's VMs keep running
but the panel forgets them and their owners, a deleted user's VMs
stay, a group's members keep their accounts, a VM's owner loses only
the access, a removed VM's record no longer brings its owners back,
an SSH key stays on the VMs that have it, a flavor only goes as a
size template.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

templates/common/confirm_delete.html

@@ -13,7 +13,7 @@
         <form method="post">
             {% csrf_token %}
             <div class="alert alert-warning">
-                {%trans "Are you sure you want to delete" %} "{{ object }}"?
+                {% blocktrans %}Delete "{{ object }}"?{% endblocktrans %} {{ consequence }}
             </div>
             <div class="mb-0 float-end">
                 <a class="btn btn-primary" href="javascript:history.back()">