-Fixed bug in DriverDocumentsTab that would call showTranslations for a
selected sentence even if the sentence is selected and it's translations
are already shown (this created a sort of glitchy effect as the panel
was repainted with the same information every time).

-Fixed a bug in DriverDocumentsTab that, when iterating the cursor to
the right via the directional keys, the translations would not change
with the sentence change.

-ACTUALLY fixed the bug this time where the application would warn about
unsaved changes even if the document wasn't modified.

-The warn on quit now works with OS X's Menu > Quit or Command Q.