i18n: write zh-Hant as zh-CN in Traditional characters

Rebuild the zh-Hant catalog from zh-CN with OpenCC s2tw glyph
conversion, so wording and terminology match zh-CN and only the
script differs. Drop Taiwan-specific vocabulary and wording notes;
zh-TW/HK/MO browser tags still select zh-Hant.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

docs/CURRENT-STATE.md

@@ -3744,7 +3744,7 @@ Shipped locales: **en** (source and fallback), **es**, **ru**, **zh-CN** and **z
   value). English has no catalog; every other locale is
   `src/i18n/locales/<code>.json`, and a missing entry falls back to English.
 - **Locale choice.** `?lang=` → stored choice (`gev:locale:v1`) →
-  `navigator.languages` → English. Chinese tags default to `zh-CN`; `Hant`, `TW`, `HK` and `MO`
+  `navigator.languages` → English. Chinese tags default to `zh-CN`; Traditional Chinese tags
   select `zh-Hant`. Explicit `Hans` selects `zh-CN` regardless of region. `?lang=` is not stored, and share links drop
   it, so a recipient keeps their own language. The globe picker in the
   bottom-right corner (`src/ui/localePicker.js`) stores the choice, drops