I am not able to add a language because I simply don't have the link 'Add additional language. I have system administrator rights so I should actually have the rights to do so.
This is not possible in Cloud (without using a custom add-on like that suggested by @Robert Massaioli in the other answer).
Comparing the cloud documentation at: https://confluence.atlassian.com/confcloud/code-block-macro-724765175.html
...with the server documentation at: https://confluence.atlassian.com/doc/code-block-macro-139390.html
Only the server documentation has the "To add an additional language" section.
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