[Unknown Mod][Adventure Map] Indicate whether there is a message written on a sign (and a bottle, and a Sphinx) or not when this location has not yet been visited

[LeHerosInconnu]

Indicate whether there is a message written on a sign (and a bottle, and a Sphinx) or not when this location has not yet been visited (when the location has been used purely decoratively by the scenario creator).

Sign with a message, display:
"Sign

(message)"

Sign without a message, display:
"Sign

(no message)"

Same thing for the Bottle on the ocean.

Bottle with a message, display:
"Bottle

(message)"

Bottle without a message, display:
"Bottle

(no message)"

Same thing for the Sphinx.

Sphinx with a riddle, display:
"Sphinx

(riddle)"

Sphinx without a riddle, display:
"Sphinx

(no riddle)"

This is not an option.
This can be implemented directly in fheroes2.