add filters by usage, location, etc.

[yakhinvadim]

trafficstars

[yakhinvadim]

showCardsWithSituation: {
	written: true,
	'especially written': true, // what about this? http://www.ldoceonline.com/dictionary/high
	spoken: true,
	formal: true,
	informal: true,
	technical: false,
	literary: false,
	'old use': false // what about this? http://www.ldoceonline.com/dictionary/be
	...
}