fail2ban compatible login log (no permissions for /var/log/ispconfig/login.log) - to be fixed! (FS#2244)

- Fixed: FS#2292 - monitor_tools.inc.php uses /var/vmail and not the mail directory specified in server config
- Changed code comment in login/index.php file.

Fixed: Notice: Undefined variable: maintenance_mode_error in /usr/local/ispconfig/interface/web/login/index.php on line 238

reason: not necessary here, check is in line 141, when checking in line 117 and setting $user to false user blocked message will never show

- Added UFW firewall support.

- Fixed bug were the interface is enabled after an update on a server were interface = no selected during install
- Fixed a replication problem and made replication more fault tolerant.

It is now possible to redirect to a different url as result of the loadContent AJAX function

* Cleanup some stuff into login/index.php like globals
* Add errors to the lang files

Added a variable check in app.inc.php

* Silenced error in login/index.php

* Also replaces " with ' 

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