[IMPROVE] User gets feedback when a message has been starred or unstarred #13860
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Closes #13857
![Screenshot from 2019-03-23 01-31-33](https://user-images.githubusercontent.com/40834245/54849918-a1709600-4d0b-11e9-8c7f-b91abc79ce9d.png)
![Screenshot from 2019-03-23 01-32-33](https://user-images.githubusercontent.com/40834245/54849919-a1709600-4d0b-11e9-8610-8158c81b2475.png)