Add date_equals validation message

Author: staudenmeir

resources/lang/en/validation.php

@@ -32,6 +32,7 @@
     'boolean' => 'The :attribute field must be true or false.',
     'confirmed' => 'The :attribute confirmation does not match.',
     'date' => 'The :attribute is not a valid date.',
+    'date_equals' => 'The :attribute must be a date equal to :date.',
     'date_format' => 'The :attribute does not match the format :format.',
     'different' => 'The :attribute and :other must be different.',
     'digits' => 'The :attribute must be :digits digits.',