This updates the Traditional Chinese (`zh_TW`) locale coverage across
Chatwoot so the app no longer falls back to English for missing backend,
dashboard, widget, and survey strings.
## How to test
1. Start Chatwoot locally and switch the UI locale to Traditional
Chinese (`zh_TW`).
2. Walk through the main product areas: dashboard, settings, inbox
management, help center, automations, reports, widget, and survey flows.
3. Confirm the UI surfaces translated Traditional Chinese copy instead
of English fallbacks.
4. Spot-check newly added locale surfaces such as secure password
messaging and snooze UI copy.
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Co-authored-by: Sojan Jose <sojan@pepalo.com>
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