Add 'explanatory bubbles' when trainer hovers over technical terms

[megdeb]

Additional UI enhancements were suggested during follow up interviews. For example, when a trainer goes to configure a profile they wish to demonstrate or simulate during a training, several trainers suggested if you hover over DNS blocking, an explanation/definition bubble would then pop up automatically, in order to provide more information to trainer so they can select the best configuration for their specific use-case.