improve wesnoth version warning.

(cherry-picked from commit ba18e17)

src/server/server.cpp

@@ -989,7 +989,7 @@ void server::add_player(socket_ptr socket, const wesnothd::player& player)
 		send_server_message(socket, motd_);
 	}
 	if(version_info(player.version()) < secure_version ){
-		send_server_message(socket, "you are using version " + player.version() + " which has known security issues that can be used to invade your computer. We strongly reccomend to update to a newer wesnoth version");
+		send_server_message(socket, "You are using version " + player.version() + " which has known security issues that can be used to compromise your computer. We strongly reccomend to update to a newer wesnoth version!");
 	}
 	if(version_info(player.version()) < version_info(recommended_version_)) {
 		send_server_message(socket, "A new version wesnoth " + recommended_version_ + " is out!");