Add a visual graph also in the view page

In the view page, we show the visualization of the graph only via braille, speech and tones. Sighted people have know means currently for seeing the visualized graph. This is necessary for teachers or tutors for blind users, who may want to see the graph to be able to work with their students effectively.

Start by locating the view page and the existing graph-visualization entry points for braille, speech, and tones. Determine what visual graph presentation the page should provide for sighted teachers or tutors, and treat the work as done when the graph is visibly available there alongside the existing modes.

Written by the indexing model from the issue text.