Translate plugin icon

Why is the post of ezekielf hidden? I cannot see, who flagged it?

I flagged it as “off topic” because I wanted to suggest to branch this discussion into an own topic. Not sure how this works in Discourse. Apparently a flagged post is hidden immediately until a mod decides what to do with the flagging(?)
I am not even sure if Discourse allows (mods) to branch off discussions.

Should topic titles in lists be translatable too? Like Nop proposed.

There is no reason why they shouldn’t. It is simply not implemented in that plugin we are using.
The plugin is not really actively developed, but maybe if someone fluent in Ruby created a PR, it would be merged.