refs #17100 [master-v5]

* changes the heading for record view/detail view from h3 into h1
* turns toolbar description in record view/detail view into proper sr-only heading + adds translations
* fixes bookbag button paddings for toolbar in record view/detail view
* make offcanvas back buttons in sidebar more prominent + align properly
* clarifies media queries comments section
* fixes checkbox input postioning error on XS devices
* fixes headings hierarchy in myresearch/profile and menu
* fixes first header in sidebar
* fixes sidebar back button color in result view