-Fixed FS#2672 - Rename website - APS instance domain must be renamed as well.

- App Installer: make sure that package URLs get inserted in aps_packages table even when process of updating the packagelist is aborted or reloaded.
- Added an explanation page before package lists are updated.

- Fixed "usermod: user web25 is currently used by process 8106" error when a site is moved between clients.

- nginx: Fixed error messages of server cron when moving websites with vhost subdomains between clients.

- Make sure $custom_fastcgi_php_ini_dir is a directory.

- Merged language files.

- Extended the tform ISIP check and added the options 'allowempty' and 'separator'

- Bugfix: when you delete a client with a web site, website symlinks have to be deleted from the client directory before the client directory is deleted (because otherwise the client directory cannot be deleted).

Improved faukt tolerance of the server.sh process when master DB becomes inavailable during script run multiserver setup.