Add message for UUID validation rule

resources/lang/en/validation.php

@@ -112,6 +112,7 @@ return [
     'unique' => 'The :attribute has already been taken.',
     'uploaded' => 'The :attribute failed to upload.',
     'url' => 'The :attribute format is invalid.',
+    'uuid' => 'The :attribute must be a valid UUID.',
 
     /*
     |--------------------------------------------------------------------------