Kingdom overview screen. Captains presence in castles

[Branikolog]

For me, as for not experienced H2 player, the same portraits in this window are rather confusing. I think, we should add some sort of description here, so player would understand, that these portraits are captains, defending castles. It can be a specific symbol or just simple title under a portrait.
Also, we cannot get the information, if a captain was built, in a case we have a visiting hero.