As long as everything fits in the 1000 characters you can add as many languages as you can fit in there. But there is no way to enter multiple long descriptions in several languages. If you have translated descriptions in German, please contact us.
We recommend starting the pattern description with
“This pattern is available in English, German, and Klingon” (or the languages you offer) and then continue the pattern description in English and if you have short snippets in the other languages.