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>

computes/views.py

@@ -6,6 +6,7 @@ from django.http import HttpResponse
 from django.shortcuts import get_object_or_404, redirect, render
 from django.urls import reverse
 from django.utils import timezone
+from django.utils.translation import gettext_lazy as _
 from instances.models import Instance
 from libvirt import libvirtError
 from operations import claims
@@ -127,7 +128,9 @@ def compute_delete(request, compute_id):
     return render(
         request,
         "common/confirm_delete.html",
-        {"object": compute},
+        {"object": compute,
+         "consequence": _("Its VMs keep running on the host, but the panel forgets them and who owns them; "
+                          "added again, the host's VMs come back without owners.")},
     )