What is the red flag next to the “known” button for… to encourage people to click it?
Sorry. That is a flag we added to enable us to weed out poor hints. If you see a word with bad hint just click the flag and we will look into it. Note: The flag is only visible to editors.
I am an editor in Japanese and Russian, but I don’t see any red flag when I hover on blue word…
@Cakypa - I just changed something. Can you see it now?
Mark, yes, I see it now 
I cannot see the red flag 
Where can I find this feature? I find quite often wrong translations/hints…
Sorry! Give us a few more days. It’s not quite ready.