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/es/panel.php

@@ -144,6 +144,25 @@ return [
         'select_all' => 'Seleccionar todos',
     ],
 
+    'expiring' => [
+        'heading' => 'Próximos vencimientos',
+        'description' => 'Convocatorias que cierran y contenido que sale de la web en los próximos :days días.',
+        'types' => [
+            'calls' => 'Convocatoria',
+            'pages' => 'Página',
+            'projects' => 'Proyecto',
+            'services' => 'Servicio',
+        ],
+        'events' => [
+            'closes' => 'cierra :when (:date)',
+            'unpublishes' => 'sale de la web :when (:date)',
+        ],
+        'notification' => [
+            'title' => '{1} Una cosa vence pronto|[2,*] :count cosas vencen pronto',
+            'open' => 'Abrir',
+        ],
+    ],
+
     'duplicate' => [
         'label' => 'Duplicar',
         'heading' => 'Duplicar como borrador',