PS-689 Android: Accessibility - back buttons in search and vault > bin lack appropriate accessible name (#1929)

* PS-689 Added back buttons accessibility text

* PS-689 Changed resource key from "GoBack" to "TapToGoBack"

* PS-689: class rename

src/Android/Renderers/CustomPageRenderer.cs

@@ -0,0 +1,31 @@
+using System;
+using Android.App;
+using Android.Content;
+using AndroidX.AppCompat.Widget;
+using Bit.App.Resources;
+using Bit.Droid.Renderers;
+using Xamarin.Forms;
+using Xamarin.Forms.Platform.Android;
+
+[assembly: ExportRenderer(typeof(ContentPage), typeof(CustomPageRenderer))]
+namespace Bit.Droid.Renderers
+{
+    public class CustomPageRenderer : PageRenderer
+    {
+        public CustomPageRenderer(Context context) : base(context)
+        {
+        }
+
+        protected override void OnElementChanged(ElementChangedEventArgs<Page> e)
+        {
+            base.OnElementChanged(e);
+
+            Activity context = (Activity)this.Context;
+            var toolbar = context.FindViewById<Toolbar>(Resource.Id.toolbar);
+            if(toolbar != null)
+            {
+                toolbar.NavigationContentDescription = AppResources.TapToGoBack;
+            }
+        }
+    }
+}