Prevent 60 seconds delay in mailbox creation when mapping of mailbox zui and gid to web uid and gid is not used.

This reverts commit bb664a22.

Added missing strings to language file.

NOTE: I did only translate de and en!

Conflicts:
	interface/lib/classes/remoting.inc.php
	interface/web/mail/templates/mail_user_backup_list.htm
	interface/web/sites/lib/lang/en_web_backup_list.lng
	interface/web/sites/lib/lang/es_web_backup_list.lng
	interface/web/sites/lib/lang/tr_web_backup_list.lng
	server/plugins-available/backup_plugin.inc.php