I can't find any signs or reference that it has been translated.
I think it never was. Yes, it has, just found out.
The book - of which the title translates as
Eric, or the Book of Insects - was written in 1940 by Godfried Bomans (1913-1971). It is basically a book for kids, but his style and humor of writing makes it an enjoyable read for all. Bomans is my great example.
I just found a Wikipedia page about Bomans and this book. It turns out it has been translated in English after all.
Erik or the small book of insects