what about lower case for week days and month?

[dantetemp]

they can be relevant for some languages (e.g., russian)

[WenchaoD]

http://cocoadocs.org/docsets/FSCalendar/2.0.1/Classes/FSCalendar.html#//api/name/locale
http://cocoadocs.org/docsets/FSCalendar/2.0.1/Classes/FSCalendarAppearance.html#//api/name/caseOptions