notificationservice/resources/lang/en/errors.php

<?php
return [
    'model_not_found' => 'Does not exist any instance of :model with given id',
    'unexpected_error'=> 'Unexpected error. Try later',
    'service_unavailable' => 'Service unavailable',
    "phone_already_associated" => "You already have a phone associated . Do you want to change it ?",
];