[Unknown Mod][Adventure Map] Indicate the sign's message when the player right clicks on the sign when this sign has been visited by one of the player's heroes

[LeHerosInconnu]

Indicate the sign's message when the player right clicks on the sign when this sign has been visited by one of the player's heroes.
The standard message window is used for this purpose.

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