The translation is dependent on their ability to raise money for this effort via crowdfunding. So if you (or someone you know) are excited about this prospect, here are the links where you can contribute. They also share further information about the publisher, project leader, and translator for the book.
This is the main crowdfunding link; it is in Japanese, but many browsers can translate the page for you:
https://greenfunding.jp/thousandsofbooks/projects/5658
And here is a supplemental crowdfunding page on Indiegogo, which is in English and in USD currency:
https://www.indiegogo.com/projects/japanese-translation-of-whipping-girl#/
Like I said, please feel free to share these links, as they have until mid-April to raise the necessary funds for the translation.