#69 Card detail dialog - Bits

[k_uber]

Change the naming of "Bits" field in the Card Details screen to better represent the purpose of the field. Bits doesn't mean anything to non-programmers.
As I understand it, it can be "new", "drill", or "drill quiz".
New means a new card, unmemorised.
Drill means it's in the drill stack.
Quiz means it's in the quiz stack.
Maybe call it Card Type or otherwise rethink how to show this more logically.