If you have the Reply Open/Closed hack installed, instead of editing the showthread template, just change the showthread_replyopen template to read what's in the attached text file and it works like a charm!
Also, b-b00gie, you might want to make sure that your edit actually includes the { imagesfolder } replacement text (without the spaces) rather than
https://vborg.vbsupport.ru/images/ link, so that people are using their own quote button instead of vBulletin.org's!
Thanks to Chen for such an awesome hack, and to you b-b for an excellent edit!