You can get more information about domains licensing contacting firstname.lastname@example.org
Generally speaking, you can have different domains for different sites, such as www.mysite.de and www.mysite.pl or you can have sites as subfolders of another site, such as www.mysite.com/de and www.misite.com/pl. You can also have nested folders such as www.mysite.com/support/de
Additional information about multisite could be found here
Information regarding multilinual support is available in that article
I hope the information helps.
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