Add unit 'league'

modules/core/dimensions.nbt

@@ -50,6 +50,7 @@ dimension AbsorbedDose = Energy / Mass
 dimension EquivalentDose = Energy / Mass
 
 dimension DynamicViscosity = Pressure × Time
+dimension KinematicViscosity = Length^2 / Time
 
 # Other useful names
 

modules/units/imperial.nbt

@@ -30,4 +30,7 @@ unit thou: Length = inch / 1000
 @aliases(fathoms)
 unit fathom: Length = 2 yard
 
+@aliases(leagues)
+unit league: Length = 3 mile
+
 unit mph: Speed = miles per hour