Also "strenuously" is not a very commonly used word (at least not in America) but from what I know the official meaning is "with great effort and determination". so that would be correct.

Good luck, I know the English language has a ton of bullshit contradictions that seem like they'd bee really hard for someone to have to learn.

I am learning English...（Strenuously）emmm，It sounds pretty good.

Though if it just said "adds windows to the wooden doors" that would also work just fine too.

Actually now that I'm proof reading it, it should say there are six windows instead of four. Though you can clearly see that in the images, so not really too important. Just can't let myself go uncorrected.

@Teoidc English is not my Mother tongue, thank you for your advice.

A better name would be "Windowed Door (For Wooden Doors)". A better description would read as such... "Adds four windows to the wooden doors, allowing you to see what's on the other side."
Feel free you just copy paste all that. Also would love something similar for steel doors.