New feature: reverse translate

[muten84]

Hi nice library, it could be a nice feature enabling Jovanotti to translate from its slang.

Input Feffantafei => Sessantasei.

Jovanotti Will thanks us all.

[dottorblaster]

I'd like to work on this but in order to avoid turning proper f's to proper s' I think we need a dictionary-based lookup to increase accuracy 😬

[pqnet]

Machine learning could be useful for that

[dottorblaster]

@pqnet also a blockchain.