Greasy Fork is available in English.
Add a direct link for each image in a tweet after "Reply/RT/Like/DM" icons
Please note that this script only works on traditional twitter web, new twitter mobile version (sometimes opening with a desktop browser will show you the "mobile" version) isn't supported for now as twitter uses some new frameworks which is difficult to work with. Thanks for your understanding.
Doesn't work
I see no download button