mailbox backend: fix create identity form title when mailbox exists

src/controllers/backend/MailboxBackendController.ts

@@ -88,6 +88,7 @@ export default class MailboxBackendController extends Controller {
                 id: user.id,
                 userName: user.as(UserNameComponent).name,
                 name: await mainMailIdentity?.toEmail() || 'Not created.',
+                exists: !!mainMailIdentity,
             },
             domains: mailDomains.map(d => ({
                 display: d.name,

views/backend/mailbox.njk

@@ -45,7 +45,7 @@
             </table>
 
             <form action="{{ route('backend-create-mail-identity', mailbox.id) }}" method="POST" class="sub-panel">
-                <h3>{% if mailboxIdentity == null %}Create a mailbox{% else %}Create a new mail identity{% endif %}</h3>
+                <h3>{% if not mailbox.exists %}Create a mailbox{% else %}Create a new mail identity{% endif %}</h3>
 
                 <div class="inline-fields">
                     {{ macros.field(_locals, 'text', 'name', user.name, 'Email name', null, 'required') }}