add duplicate_number for en lang

Author: milwad-dev

src/lang/en/validate.php

@@ -26,5 +26,6 @@
     'url' => 'The :attribute is not valid',
     'username' => 'The :attribute is not valid',
     'uuid' => 'The :attribute is not valid',
-    'jalali_date' => 'The :attribute is not valid'
+    'jalali_date' => 'The :attribute is not valid',
+    'duplicate_nubmer' => 'The :attribute is not valid'
 ];