refs #17908 [finc, VF5.1, BARF] more accessiility rework

* corrects lightbox and scss
** restores lightbox.js
** turns navbar-height calculation into correct formula
* bugfixes xs
** changes offcanvas toggler into link
** hides media icons on XS by default
** adds margin-right to lang menu
* fixes media display in result list
* reverts hiding media icon (breaking change)
* fixes IDs and anchors for correct sidebar functionality
* fixes more sidebars
* removes solo switch in record view
* replaces strcmp operation in header since header is used in most
instances
* fix to lang menu: removes over-complicated hidden attribute