Reverted SVN trunk back to revision 3938 to remove changes in default theme an a replacement of the ispconfig logo.

- Added backup size to web backups

- need to have the pecl idn and intl modules installed
  or
- have the idna_convert class in the classes/idn/ path

Fixed/Implemented: replaced intval() by $app->functions->intval() in all interface functions due to big number problem in intval()

Fixed: password match function blocked tabs incorrectly
Fixed: set focus on username input field threw an error if this field did not exist on a page

Fixed: Some templates used changeTab in a way that was not compatible with the new options to discard changes on changeTab

Moved old default theme to themes/default-304

Addes some missing translations

- Implemented: FS#1935 - Add minimum allowed seconds Value for DNS zone records