Update Some Tennis-Specific displays to be more flexible.

There is still some nomenclature and displays that are laid out in ways that are explicit to tennis, which causes confusion for members of pickleball clubs.

For example, when they look at the membership breakdown, it shows them how many days out they can "reserve." Most pickleball facilities focus much more on the "events" than the "reservations" and this creates a lot of confusion (and it seems to be hard-coded).

I think the whole Events vs. Reservations nomenclature could be updated. Nobody understands the difference until we explain it to them, which is a sign that the naming system isn't good.