From the icons identified, we have just 33% of them using Icon Themes
variables. Ideally all our icons should use Icon Theme variables. The
problem is that the icon themes are used inline (using the <img> or <span>
elements), and we have lots of places where we are using icons from CSS
(using background-image), so in order to change the usage, it needs
rewriting the functionality.
Anyway, using the overview it's easier now to identify what are the places
that could make an easy switch.