Language packs for libreoffice and firefox?

Hi. I tried NixOS. Here is my configuration.nix:

I found that there are no languages packs (for example libreoffice-fresh-zh-cn)available in NixOS, can I get language support by only editing the configuration file? Or… I have to build it from source?

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As usual if something is missing it’s just that a user hasn’t done the packaging work yet. So thanks for helping!

This seems somewhat related to: