Hello Marcus,

For the articles to show up in a specific language, the translated version had to be setup for each article under the solutions section. It doesn't translate articles automatically and that would be the reason why no article shows up on the portal for other languages. 

For more information, please visit : https://support.freshdesk.com/support/solutions/articles/219745-setting-up-a-multilingual-knowledge-base

Cheers!