set webdav sys_groupid onAfterInsert, it didn't work onBeforeInsert. Change server_id and sys_groupid if parent_domain_id changes

- Add option to _get functions of the remote-api to return all records when primaryID = -1
- Fixed permission problem in _get functions of remote api.
- Fixed typo in german dashboard language file.

- Fixed: nginx placeholders could not be added to directive snippets textarea by clicking on the link.

Fixed regex in prefix validation under System > interface config that prevented numbers in prefixes.