Dialogue uses same text style as tabs [1/1]

[Problem]
Dialogue text was not using the same style as the tabs.

[Solution]
Set the dialogue text to use the same style.
Issue-9: Time left text is changed by multiple students [1/1]

[Problem]
The views in the ListView are being recycled and the active student callbacks are updating the same TextView causing the
"time left" text in the student entry to flip-flop between different active student's time left.

[Solution]
Set the callback of the previous student in the ArrayAdapter.getView() to be null.