There is an updated pull request by oreo639 against master on the void-packages repository

https://github.com/oreo639/void-packages files
https://github.com/void-linux/void-packages/pull/39264

base-files: don't overwrite existing locale and define default LANG
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#### Testing the changes
- I tested the changes in this PR: **YES**

Fixes overwriting user/desktop specified locale.

Closes: https://github.com/void-linux/void-packages/issues/15292

Based on what is done on Arch:
https://bugs.archlinux.org/task/42162
https://github.com/archlinux/svntogit-packages/blob/master/filesystem/trunk/locale.sh

You can see here for the `locale.conf` specification: https://man7.org/linux/man-pages/man5/locale.conf.5.html

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A patch file from https://github.com/void-linux/void-packages/pull/39264.patch is attached