Styling follow-up due to new HTML
[TASK] Bring Toolbar styling for Bootstrap HTML5 markup
Toolbar now is based on Bootstrap compatible HTML5 markup.
Styles all elements. Removes the previous CSS compatibility layer.
Layout in Toolbar dropdown menu is out of scope (#62927, …).
Reviewed-by: Georg Ringer <email@example.com>
Tested-by: Georg Ringer <firstname.lastname@example.org>
Reviewed-by: Benjamin Mack <email@example.com>
Tested-by: Benjamin Mack <firstname.lastname@example.org>