Updated timetable scraping to reflect new Lang Req column

[zack-overflow]

Motivation

Dartmouth added a new column to the timetable to indicate something about the new language requirement for incoming students, so we have to adjust a couple lines to reflect the change in the number of columns being scraped from the timetable

Implementation

Adding the language requirement key to the request body, changing the assertion about the expected number of columns, and changing some list indices of the parsed timetable. All these are in timetable.py.