Add multilingual support for Ghost Dawn Theme

[Travisun]

This pull request introduces multilingual support for the Ghost Dawn Theme. With this update, the theme can now automatically switch languages based on the language code set in the Ghost admin panel.

Features:

• Added support for the following languages:
  • German (de)
  • English (en)
  • Spanish (es)
  • Finnish (fi)
  • French (fr)
  • Italian (it)
  • Japanese (ja)
  • Korean (ko)
  • Russian (ru)
  • Thai (th)
  • Chinese (zh)
  • Simplified Chinese (zh-CN)

Instructions:

To utilize the multilingual feature, simply set the corresponding language code in the Ghost admin settings. If you are using a CDN, please clear the cache to see the changes take effect.

Ghost Admin Page -> General settings -> Publication Language -> Edit -> Type Site language with correct lang-code, like de/en/es/zh-CN

Additional Notes:

• This enhancement aims to improve accessibility and user experience for a diverse audience.
• Please review the changes and let me know if there are any questions or further modifications needed.

Thank you for considering this contribution!