Better number treatment

[PascalSalzbrenner]

I don't like that it replaces all numbers with the token, but it does not have numbers in its dictionary. Treating numbers properly is important, for example, for distinguishing different heat treatment temperatures. I am not sure how to deal with this.

[PascalSalzbrenner]

Transform numbers into words, either 425 -> four two five, or using https://github.com/savoirfairelinux/num2words.

Note that there are also fractions, eg 1/8.