Migrate d3js to v4 and correct d3js visualisations i.e. bug 3.20. Breadcrumb navigation for the language treemap has been improved
<ul>
<li {{ action 'display' 'notice'}} class="{{if (eq player.window 'notice') 'active'}}">Notice</li>
{{#if player.transcript}}
<li {{ action 'display' 'transcript'}} class="{{if (eq player.window 'transcript') 'active'}}">Transcript</li>
{{/if}}
{{#if player.model.video}}
<li {{ action 'display' 'video'}} class="video {{if player.videoscreen 'active'}}">Video</li>
{{/if}}
</ul>