Merged language files.

Prevent password managers to overwrite passwords in reseller / client and mailbox edit screen (fixes #4030)

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

Fixed error in Mail-Backup-Cron-Task (created file /dev/nul - missing l)