Merge branch '455-update-timestamps-of-messages-every-minute' into 'master'

Update Timestamps Every Minute

Yes by using `notifyDataSetChanged()` I am invalidating everything, but view binding is very fast and the RecyclerView is smart about it. I could parse the dataset and use `notifyItemChanged()` only on the elements that matter, but this is not generic and a lot more code which is not necessarily faster. I suggest we go with my simple and generic approach for now and optimize when we actually notice a performance problem.

Closes #455

See merge request !238