How to change the time format / Appointments+

Hi guys,
is there a way to change how time is displayed on Appointments+ booking calendar. The site I´m working on is in Finnish, so I would like to get rid of the "am" and "pm".
Generally we use time expressions like 8 am = 8:00, 5 pm = 17:00, but I could settle for getting rid of these expression.

Oh, by the way. How did I manage to get the date format on the calendar rows to change from Mo to Monday. I´d really like to get the short versions back again.

Thanks, Aleksi