You can download new language packs from Parallels site and install them to the control panel. The number of languages you can use with your control panel depends on the license key you purchased. The control panel will alert you when you attempt to install more languages than allowed.
To view the interface languages installed in the control panel:
Note: you can make a language unavailable to control panel users. To do this, click an icon . To make a language available to users, click an icon
.
To install a new language pack that you downloaded from Parallels Web site:
If you use an RPM-based system, use language pack files with the .rpm file name extension.
If you use a DEB-based system, use the language pack files with the .deb file name extension.
If you use a FreeBSD system, use language pack files with the .tgz or .tbz file name extension.
If you use a MacOS system, use language pack files with the .sh file name extension.
To uninstall a language pack from the control panel:
If the language pack you have just removed is used by some other users, their interface language will be automatically set to the default language. The default language of the Plesk distribution package (en-US) cannot be removed.