Hey Björn,
The language is a plugin, so we just need to disable the espanhol and the chineese language pack from it. You can go to Cog Icon > Confluence Admin > Manage Add-ons, Type: Language and select "All add-ons" in the dropdown menu.
Once you get to the plugin, just click on Disable, and this should do the trick.
Cheers,
WZ
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