[Unknown Mod][Game] Display the rest in resources, in parentheses, if the transaction is accepted, in the upgrade window

[LeHerosInconnu]

Display the rest in resources, in parentheses, if the transaction is accepted, in the upgrade window.
Note: the amount of resources in parentheses may be negative, indicating to the player that the entire troop cannot be upgraded, and at the same time the amount of resources that must be acquired in order to do so.

So for the text, in the example:

"300 (12300)"

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