There is a new pull request by newbluemoon against master on the void-packages repository

https://github.com/newbluemoon/void-packages sylpheed
https://github.com/void-linux/void-packages/pull/34042

sylpheed: fix localedir
Current package has no locale files at all.

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A patch file from https://github.com/void-linux/void-packages/pull/34042.patch is attached