Whichlang

Whichlang is used at run time in 3 crates (of which 2 optionally).

Depender (with downloads and own rev deps)			Whichlang version
9.4K	10	lingua	optional	^0.1.0
2.0K	1	bm25	optional	^0.1.0
		dawnsearch		^0.1.0