When you type it and it's correct, the box where you typed it will immediate change from "[what you typed]" to "Translated message: [what you typed]" and in a different font. When you press ENTER or exit that screen by pressing EXIT at the bottom left it should show you that same paper but with writing on it and MC talking about it for a while. That paper in your inventory should also now have writing on it. For now that's where it ends. The next part should be in another update.