"Please register or log in to reply this topic" is shown at the bottom of a post for guests.

But since my site is not in English, how can I modify this text? It's particularly weird because I can't seem to find it under "wpForo -> phrases". Plus very unfortunately, the translate plugin I use (translatepress) can't handle text that is only shown for guests.

I'm really not seeking multi-lingual compatibility at this point; any hard-code way to modify this text would suffice.