Adds crates/ui-egui/locales/id.toml, a draft Indonesian catalog covering
every UI string (1,577 keys), command label (557) and menu wording (31),
machine-drafted and marked "draft — needs native review".
Indonesian keeps a noun unchanged after a count, so plural entries give
only `other` and plural_one needs no change. Preferences ▸ Language lists
Bahasa Indonesia; System maps id / id_ID to it (new assertion in
i18n_tests.rs) and `id` joins the cjk can-show list. Docs updated.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>