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In update files and languages, language means the language for updates. If there are some machines installed some Microsoft products in other language version(such as English, Spanish), WSUS server will provide updates for those languages.
Language Pack is not a patch, it is a feature. If it is not installed there, the package will be reported as Needed, and will be installed if approved.
If you do not need them, just decline them.
In addition, under Production, you may have Language pack selected, so your received language pack.
Regards