[STYLE] Prevent text from overflowing lesson <div>s
[STYLE] Prevent text from overflowing lesson <div>s

By using `word-wrap:break-word`. Big thanks to

    http://stackoverflow.com/questions/1165497/can-i-prevent-text-in-a-div-block-from-overflowing

Signed-off-by: Pang Yan Han <22594c345857f664c61cd411f607c4d40a9d4af9@gmail.com>

yanhan/cljs-nusmods,yanhan/cljs-nusmods,yanhan/cljs-nusmods