Update the empty-state text and description

See #695

This does not fix the empty-state entirely since it only updates the text and image. We still need to update the internal widget's, which are provided by libhandy. See Teams/Design/initiatives#83 (comment 1107918) for more info.

As it is now, the image used obviously needs some resizing and repositioning, so I am going to leave the image part for a follow-up MR.