Can anyone tell me the name of the 3 bonus`s below:
Bucarest.
Sofia city.
Bernese Mittland.
I am trying to adjust the bonus value.
Map link:
https://www.warlight.net/Map/3722-Europe-Big
I can find all of the other capitals except those 3.
i.e, Madrid is called Madrid, and Lisbon is called Lisboa.

It appears that the map-creator forgot to add a bonus for these 3 capitals. they simply don't exist, this is why you can't find them.

Rather than guess by saying bern, you will need to look at the game map

Ah
Is it fixable

Timinator is correct--although those 3 territories are part of the overall capitals bonus, they do not have their own individual bonuses. You can tell by using the "More Information" button for each territory and then scrolling down to see the bonuses listed for that territory.

Since the mapmaker is gone forever, Fizzer said he might let people fix things on maps. However you would have to earn Fizzer's trust, which is a hard thing.