layout and styling tweaks

.../app/admin/databases/partials/database_master_detail.html

...t/app/admin/databases/partials/database_table_detail.html

...ent/app/admin/databases/partials/database_table_list.html

resources/frontend_client/app/components/buttons/buttons.css

resources/frontend_client/app/css/admin.css

resources/frontend_client/app/css/core/base.css

resources/frontend_client/app/css/core/box_sizing.css

resources/frontend_client/app/css/core/grid.css

resources/frontend_client/app/css/core/headings.css

resources/frontend_client/app/css/core/text.css