Add i18n support

[dsentker]

It would be a nice feature to add internationalized vocab to use this library in apps which target no-native-english-speakers.

[waxim]

I had considered that but the it could complex fast because most other languages are gendered, so there would have to be some complex code to "genderfy" words, if we wanted to do it properly.

I guess to keep it simple we could do a straight swap on genders and force all international languages to supply at least one pronoun which could be used by default.

I'll have a think over the weekend, lots of people have complained that this is already very overcomplicated so maybe I'll pair it all back which might make i18n a little simpler.