How to custom laravel passport error message?
<p>When I use laravel5.3's Passport <a href="https://laravel.com/docs/5.3/passport#password-grant-tokens" rel="noreferrer">Password Grant Tokens</a></p>

<pre><code>this.$http.post('/oauth/token', this.form)
     .then(response =&gt; {
         console.log(response)
     })
</code></pre>

<p>I get this message</p>

<pre><code>{"error":"invalid_credentials","message":"The user credentials were incorrect."}
</code></pre>

<p><strong>I want to know how to custom this error message.</strong></p>