Add an editorial calendar to the panel

A month of publications, scheduled dates, content coming off the site, and
calls opening and closing, each linked to its form.

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

lang/ca/panel.php

@@ -144,6 +144,27 @@ return [
         'select_all' => 'Selecciona-ho tot',
     ],
 
+    'calendar' => [
+        'title' => 'Calendari editorial',
+        'legend' => 'Llegenda',
+        'previous' => 'Mes anterior',
+        'next' => 'Mes següent',
+        'today' => 'Avui',
+        'events' => [
+            'published' => 'Publicat',
+            'scheduled' => 'Programat',
+            'unpublishes' => 'Surt del web',
+            'opens' => 'Obre',
+            'closes' => 'Tanca',
+        ],
+        'types' => [
+            'pages' => 'Pàgina',
+            'projects' => 'Projecte',
+            'services' => 'Servei',
+            'calls' => 'Convocatòria',
+        ],
+    ],
+
     'expiring' => [
         'heading' => 'Pròxims venciments',
         'description' => 'Convocatòries que tanquen i contingut que surt del web en els pròxims :days dies.',