Finished but not fully reviewed translation: https://file.io/j9WVZPwZuCud
*Link expires in 1 month.
Big edit:
How to use, delete all files in the game's en folder and add the new ones.
path-to-the-occult/heresy/locales/en
Set game's language to English,
[open game] > bottom option(settings) > last option(click until it's english)
Some game elements are untranslated, just chose "yes" for the scene.