Add news preview on notifications

[Tresillo2017]

Checklist

• [x] I checked, but didn't find any duplicates (open OR closed) of this issue in the repo.
• [x] This issue contains only one feature request. I will open one issue for every feature I want to request.

What feature do you want?

The ability to see the title and first line of the new on the notification center instead of new news number

Why do you want this feature?

So I don't have to open the app to read a new that I might not have interest of reading it.