Work to be done

Complete the exercises for the middle lectures in Track Two.
Complete the Additional Translation exercises. Currently, we show only the first two.
Make the table of contents for the translation exercises easier to understand. Currently, each exercise shows as something like "6-3-T."

"6" is the chapter,
"3" is the number of the translation exercise,
and "T" means it is one of the main translation questions. "W" is for Warm-ups and "A" is for Additional Translations.