Hi Siggi,
Thank you for contacting Syncfusion support.
As of now, we don’t have support to localize or empty the Week string name in MonthView of Schedule in UWP. We have considered this to implement and logged report for the same. We will implement and include this feature in our upcoming Volume 4 main release which is expected to be available by first week of November 2017.
Regards,
Subburaj Pandian V.