Merge pull request #694 in ZP/z-push from bugfix/ZP-1410-imap-backend-to-provide-user-details-for-caldav to develop

* commit '5ed1579f':
  ZP-1410 Dot at the end of sentences. Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-1410 IMAP backend to provide user details for CalDAV backend. Released under the Affero GNU General Public License (AGPL) version 3.