https://laravel.com/docs/5.5/validation


keywords:
- laravel validation date format locale
- laravel validation error message adjust data
- customize error message data


vendor/laravel/framework/src/Illuminate/Validation/Validator.php
vendor/laravel/framework/src/Illuminate/Validation/Concerns/FormatsMessages.php
makeReplacements

ReplacesAttributes.php
  replaceBefore
getDisplayableAttribute

ac4178d92561bd46dd8640cd5825b41d2a4759c3


addReplacer