Resolve "Correct icon color in dark mode and alignment of icons when English is selected as a language"

This reverts merge request !671

This reverts merge request !673

[Ticket: #671]

During the last meeting, some problems were pointed out.
This commit should fix some of them.

With the new directive, this function
can be implemented.

[Ticket: #487]

Adds more responsive layout for mobile users and disables go to question button when no valid token has been entered