I'm trying to change this phrase in my Tapatalk forum app, and according to Tapatalk, it's a XenForo system message that's passed to Tapatalk so they can't do anything. But I can't find it in my XF phrases...
The search comes up with nothing. I'm fairly certain I haven't edited the phrase either. I think Tapatalk is mistaken about the origin of the text, because I've never seen XenForo refer to threads as "Topics".... I'll bark up their tree again.