[tx-robot] updated from transifex
Contacts: Move vCard validation and repair to SabreDAV subclasses.
Updated header:
Fix variable name.
Use VObject\StringUtil::convertToUTF8() to decode v. 2.1 properties.
Also set version when upgrading.
Upgrade: ENCODING: BASE64 -> 'b' and format image mime types.
Merge branch 'vcard_repair' of github.com:owncloud/apps into vcard_repair

Conflicts:
	contacts/lib/sabre/vcard.php