Add "parameterization" (and GB counterpart)

[DimitriPapadopoulos]

Has 4 stars (3 for en_GB): http://app.aspell.net/lookup?dict=en_US-large;words=parameterization http://app.aspell.net/lookup?dict=en_GB-large;words=parameterisation

See also:

• Is “parameterization” or “parametrization” correct when describing which parameters describe a statistical model?