* docs(zh-tw, zh-cn): Complete missing Traditional and Simplified Chinese translations
This commit aims to complete all previously 'null' Traditional Chinese and Simplified Chinese translation keys in the project.
**Traditional Chinese (zh-tw):**
- Completed all 'null' descriptions in `/frontend/src/locales/zh_TW/common.js`.
**Simplified Chinese (zh-cn):**
- Completed all 'null' descriptions in `/frontend/src/locales/zh/common.js`.
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此提交旨在補齊專案中所有原為 'null' 的繁體中文和簡體中文翻譯鍵值。
**繁體中文翻譯 (Traditional Chinese - zh-tw):**
- 完善了 `/frontend/src/locales/zh_TW/common.js` 裡所有 'null' 的說明。
**簡體中文翻譯 (Simplified Chinese - zh-cn):**
- 完善了 `/frontend/src/locales/zh/common.js` 裡所有 'null' 的說明。
* linting
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Co-authored-by: timothycarambat <rambat1010@gmail.com>
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