add re: and cont. to threaded CWs
add re: and cont. to threaded CWs

based on the example from glitch-soc:
https://github.com/glitch-soc/mastodon/commit/8433bd89e431d5834e4252c7ca197771944aa6d1

TheInventrix/mastodon,TheInventrix/mastodon,TheInventrix/mastodon,TheInventrix/mastodon,TheInventrix/mastodon