LP#1681943 Improve Responsive Design in My Lists

LP#1681943 Improve Responsive Design in My Lists

- Moved action dropdown out of header row so that it is no longer
hidden on mobile view.
- Hid less essential columns on mobile view, leaving only title / author.
- Sized and lined up buttons more neatly on both mobile and normal view.
- Added a title to the section for editing a list title and description.

Signed-off-by: Terran McCanna <tmccanna@georgialibraries.org>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>
Conflicts:
	Open-ILS/src/templates/opac/css/style.css.tt2
	Open-ILS/src/templates/opac/parts/anon_list.tt2

Signed-off-by: Ben Shum <ben@evergreener.net>