* Open File Browser when pressing "Add Asset Library". This just makes sense, since users have to select a directory for the asset library anyway. * Move '+' icon back to the right side of the box. Then it is right under the 'x' icons for each indivdual library, which seems like the more natural place. * Correct tooltip for the "Add Asset Library" operator. * Mark empty asset library name or paths field in red, to make clear that these need to be set.