Add a new GA tracking event for "widget displayed on a page".
Add a new GA tracking event for "widget displayed on a page".

Part 2 of https://unisubs.sifterapp.com/projects/12298/issues/435496/comments

ofer43211/unisubs,norayr/unisubs,wevoice/wesub,norayr/unisubs,wevoice/wesub,wevoice/wesub,pculture/unisubs,eloquence/unisubs,eloquence/unisubs,ujdhesa/unisubs,ReachingOut/unisubs,ujdhesa/unisubs,ReachingOut/unisubs,pculture/unisubs,wevoice/wesub,ujdhesa/unisubs,ofer43211/unisubs,ofer43211/unisubs,ujdhesa/unisubs,eloquence/unisubs,norayr/unisubs,pculture/unisubs,ReachingOut/unisubs,pculture/unisubs,ofer43211/unisubs,ReachingOut/unisubs,eloquence/unisubs,norayr/unisubs