Yay, got it!
For normal case you need to add the following to your main.lang file
Month01=January
Month02=February
Month03=March
Month04=April
Month05=May
Month06=June
Month07=July
Month08=August
Month09=September
Month10=October
Month11=November
Month12=December
MonthShort01=Jan
MonthShort02=Feb
MonthShort03=Mar
MonthShort04=Apr
MonthShort05=May
MonthShort06=Jun
MonthShort07=Jul
MonthShort08=Aug
MonthShort09=Sep
MonthShort10=Oct
MonthShort11=Nov
MonthShort12=Dec
Not sure why it uses an internal table rather than the plain old PHP formatting. Maybe it's so you can have "Movember" and "Rocktober".
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