[KevinH]

Could use - Contributor metadata tag with Marc Relator code for Translator ("trl") since technically not an author. In your case you could even use editor code since you have found and made corrections. Not sure if there is any other way with metadata.

You should add your name as Translator to the title page, and as contributing author. I will add it to the authors list for the English version.

You also might want to set up a github site for your translation so that others can contribute changes as new features are added to Sigil.

Then we can add a link to it from our Sigil ReadMe if you like.