Implement an initial basic version of a depict suggestion box based on automated suggestions using the Machine Vision API

• For early testing, suggestions are only active when mv=true is set as a URL parameter on participate page (e.g. https://isa.toolforge.org/campaigns/85/participate?mv=true)
• User can click any suggestion to quickly add it
• Status is currently shown in hover text (Todo: Set colour of tag according to status)
• There seems to be no language fall-back for the imageLabels Commons API call we are using. So missing labels show as null until we add more label API calls.

Existing Machine Vision resources:

• Description page: https://www.mediawiki.org/wiki/Extension:MachineVision
• Live tool: https://commons.wikimedia.org/wiki/Special:SuggestedTags#popular