## Summary
- Adds Serbian translations for both Cyrillic (`sr`) and Latin
(`sr@latin`) scripts, registered in `src/os/i18n_locales.zig` and
`CODEOWNERS`.
- `po/sr@latin.po` is generated from `po/sr.po` with `msgfilter
recode-sr-latin` and should not be translated by hand.
- Replaces the closed#13030; strings are rebased onto current `main`.
Cc @slowdub for a review.
EDIT: AI disclosure: I used Cursor (Grok 4.6) for mechanical repo work
only, not for writing the Serbian translations. The agent fetched
ghostty-org/ghostty, branched from current main, ran msgmerge on
po/sr.po against the template, generated po/sr@latin.po with msgfilter
recode-sr-latin, registered sr / sr@latin in src/os/i18n_locales.zig and
CODEOWNERS, rebased my three commits onto later main, pushed the branch,
and opened this PR (I had intended to open the PR myself, s***** thing
ignored my instructions). I translated and reviewed sr.po and the Latin
file is a recode of that catalog, not a separate translation since
Serbian Cyrillic can be perfectly transcoded to the Latin script via
[recode-sr-latin](https://linux.die.net/man/1/recode-sr-latin).
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