Add possibility to change wings value % in-game

Hello. I've changed the values for wings in increase damage & absorb values, but can't do this in-game.
Via itemtooltip I've changed to the static value for level+0 and added an extra line like "With each level +1% extra" but a lot of players don't understand it.

It will be okay if it will be just a config via lang.mpr or .bmd file. This suggestion I remember was already in the old suggestion tracker. For 4 years.

Thanks.