How can I make changes to the Authorization Grant Page?

I'm working with the Authorization Grant flow from Zendesk to Authenticate users into my Custom Website. Once I authenticate them, a page to grant permissions appears, where users can Allow/Deny my webapp to access details from their Zendesk. 

Questions :

1. I wish to change the Content being displayed here. I really wanted to know if I can rephrase the text details like "Read all user data" to something more subtle for my customers. 
2. In the tutorial for zendesk Auth Grant flow, The same Auth Grant page looks really different that is being used by an application ("Asana"). Is there a way I can similarly customize my Auth Grant page like this? 

Detailed Imaged:

My Authorization page:

Asana's Auth page:

References: 

1.  Zendesk Authorization grant flow.
2.  Zendesk Authorization grant flow tutorial