Use US English

[TuomasBorman]

Ensure that the book is using US English. Bioconductor documentation and books are written in US English so it is good to harmonize.

@signynas

[artur-sannikov]

@TuomasBorman, there is a tool that can automate most of the work: https://github.com/orsinium-labs/eng.

And another option: https://www.npmjs.com/package/american-british-english-translator.

[TuomasBorman]

Hmmm, interesting. Could you have a look?