Revert #6479, hide sensitive text/images from OpenGraph previews (#6818)
Display summary of attachments in description, and mark up content
warning if present, e.g.:
Attached: 3 images · Content warning: Dota 2
When text is not supposed to be hidden, it looks more like:
Attached: 3 images
Here is the text of the toot
With #6817, multilinguagility should be assured...