title: How could I change the Navigastion's page arrow in Xamarin Forms?
body: <p>I'm creating an app using xamarin Forms (multiplatform), I'm using a Navigation page, but I want to change the <em>arrow</em> (&quot;&lt;-&quot;) to <em>text</em> (&quot;back&quot;)</p>
  <p>Do you know how could i do it?
  Thanks</p>
  <p>(I'm going to use it in an Android App, but I'm creating the app using Xamarin forms)</p>