EPOS - Update 2 build 8 (14.2.0.8)

WEBCLIENT

• Fixed showing of mailbox quota.
• Fixed XSS vulnerability.
• Fixed an issue with editing recurrent events in calendar.

SERVER

• Improved search for GroupWare items.
• Fixed an issue with signing emails with older DKIM key.
• Implemented new deeplink microservice.
• Fixed an issue with sending invitations to newly added attendees after suppressed notifications.
• Fixed a bug in remote console, that caused overwritten configurations.