Warn about calls closing and content coming off the site

A dashboard widget lists what expires in the next two weeks, and a daily
command reminds whoever edits it a week and a day ahead.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lang/en/panel.php

@@ -144,6 +144,25 @@ return [
         'select_all' => 'Select all',
     ],
 
+    'expiring' => [
+        'heading' => 'Coming up',
+        'description' => 'Calls closing and content coming off the site in the next :days days.',
+        'types' => [
+            'calls' => 'Call',
+            'pages' => 'Page',
+            'projects' => 'Project',
+            'services' => 'Service',
+        ],
+        'events' => [
+            'closes' => 'closes :when (:date)',
+            'unpublishes' => 'comes off the site :when (:date)',
+        ],
+        'notification' => [
+            'title' => '{1} One thing expires soon|[2,*] :count things expire soon',
+            'open' => 'Open',
+        ],
+    ],
+
     'duplicate' => [
         'label' => 'Duplicate',
         'heading' => 'Duplicate as a draft',