Most project software has the ability to saved calendars that you can base an individual resource's calendar off of. For example, I would have the following:
Base Australia Calendar
Base United States Calendar
* Base Germany Calendar
A resource would have one of those 3 calendars as their base then they could override individual days for their specific holidays.
This makes managing a large team's plan much easier.
Unfortunately, I had to manually edit the XML file to do anything close to this.