Unexplored city panel

[Zajoman]

When you click on a city shrouded by fog of war, a panel pops up with various information such as owner, income, defense strength, etc. The problem is that it shows something like:

Warlord: Neutral
City income: 0
Defense strength: (STR + 0)
Citywall level: ?

It would be much better to replace the numbers with either question marks or some term like "Unknown" or "Unexplored" to easily hint that the player must actually first get to see the city.