Add new language support for Auralytics

[WengYiNing]

Is your feature request related to a problem? Please describe.
Currently, Auralytics supports 10 languages around the world, but not all users can view the app in their native language. This may limit accessibility and cultrual diversity.

Describe the solution you'd like

1. Create a new folder under frontend/public/locales/.
2. Copy translation.json from en as a template.
3. Translate values into your prefered language.
4. Add the new language code to /frontend/src/i18n.ts.

Thanks for your contribution!