* Switched from pygettext to xgettext -> small adjustments to these files:
- 'VirtualMailManager/Config.py'
- 'VirtualMailManager/VirtualMailManager.py'
* 'VirtualMailManager/VirtualMailManager.py'
- Renamed VirtualMailManager.__maildirdelete() to
VirtualMailManager.__userdirdelete()
* 'po/de.po'
* 'po/vmm.pot'
- updated