Add missing notifications for document type and content not found

Author: cklei-carly

resources/lang/en/notification.php

@@ -19,4 +19,14 @@
     'saved' => [
         'title' => 'Saved',
     ],
+
+    'document_type_not_found' => [
+        'title' => 'Document Type Not Found',
+        'body' => 'The specified document type does not exist. Please check your configuration.',
+    ],
+
+    'content_not_found' => [
+        'title' => 'Content Not Found',
+        'body' => 'The specified content does not exist. Please check your configuration.',
+    ],
 ];

resources/lang/zh_TW/notification.php

@@ -20,4 +20,13 @@
         'title' => '已保存',
     ],
 
+    'document_type_not_found' => [
+        'title' => '找不到文檔類型',
+        'body' => '指定的文檔類型不存在。請檢查您的配置。',
+    ],
+
+    'content_not_found' => [
+        'title' => '找不到內容',
+        'body' => '指定的內容不存在。請檢查您的配置。',
+    ],
 ];