Greasy Fork is available in English.
一键保存视频/图片
I modify a few line and post a new script
https://greasyfork.org/scripts/440396-tweetdeck-media-downloader
Will be merged after a while
By the way, to make it work in the beta version of tweetdeck you can just change the urls in the twitter userscript. Although the download indicator doesn't seem to display correctly.
I love it, can you please implement this for https://tweetdeck.twitter.com/ as well?