Will have to check that but it is this but then Aslain's config/version (which I prefer !):
http://worldof-tanks.com/tag/info-panel/
That info you get when you, yes, target another tank, friendly or enemy. AND you used to get it also when you pressed left ALT yes.
Again, very handy when you switch tanks fast/a lot :p ...quick info on armor/penetration etc...