The picture you showed, is showing you holding down Tab while in a battle. With the tier icons showing. To remove those, you need to visit WoT's settings, as in the FAQ thread.
(Edit: Or maybe not, lol... shrugs)
Anyways,
I have "removeVehicleLevel" and "removeVehicleTypeIcon"
as true, in 3 files: battleLoading, battleLoadingTips, and statisticForm.
Edit 2: