start copy from cimac web

app/Http/Requests/Permission/BasePermissionRequest.php

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+<?php
+
+namespace Vanguard\Http\Requests\Permission;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class BasePermissionRequest extends FormRequest
+{
+    /**
+     * Validation messages.
+     *
+     * @return array
+     */
+    public function messages()
+    {
+        return [
+            'name.unique' => __('Permission with this name already exists.')
+        ];
+    }
+}