We have been changing the language in the general setting to German according to Choosing a Default Language | Confluence Data Center and Server 7.11 | Atlassian Documentation but it would not affect confluence.
How do we do that?
You do what the documentation says.
My guess is that you, in your account, have chosen a language in your profile, so you're not seeing the default when you log in because you've overridden it. Try visiting the site again without logging in, and then as a user who has not chosen a language.
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