title: Change return to be next/done key in Xamarin Forms Shared Project
body: <p>Is it possible to change the text in the 'return' key on the keyboard to be either 'next' or 'done'? I have a login form with username and password. I want the return key to say 'next' when on the username field and then 'done' when on the password field but haven't seen anyway of doing this. 
  This is for a shared project, android and iOS. </p>
  
  <p><a href="https://i.stack.imgur.com/wFmSO.png"><img src="https://i.stack.imgur.com/wFmSO.png" alt="Username"></a></p>
  
  <p><a href="https://i.stack.imgur.com/n9Ucy.png"><img src="https://i.stack.imgur.com/n9Ucy.png" alt="Password"></a></p>