Enhancement of the Email-Domain-List. The user can only select the server as filter, he has some mail-domains at (and not ALL Servers of the server-farm)

1) Edit a domain: The selected domain is also selected in the dropdown-list
2) Edit a domain: The admin can now select any domain not only his/her

Fixed a bug: if the domain-module is used and there are NO domains in the list, then the user was able to free edit the domain-name. This bug is fixed now and a empty list is generated, so the user can enter only a empty name!

Added a new module called "domain". With this module you can manage all domains (web + mail). Per default this module is not active. To activate it, you have to change the System Interface Config -> domains -> use the domain module. You also have to activate the domain-module for the admin (and for every client if you want). Important: you can not use this module if you have reseller!

- Set a fixed column width for the buttons in the client and reseller list.

Added European Portuguese translation. Many thanks to Miguel Almeida to provide this language file set.

Fixes Encoding to UTF-8 and Add Some New Strings

Added a option to debug the language files (show strings that are not contained in the lang file surrounded by #....#)
Fixed: FS#1063 - Missing language variables in shell user options 

Merged all language files.

Additionally fixed a bug in web quota calculation.