Add translations for file extensions and hex color

[nshiro]

以下の2つの翻訳追加しました。
https://github.com/laravel/framework/pull/49056/files
https://github.com/laravel/framework/pull/49082/files

extensions は、まだリリースされていませんが 😅

[what-the-diff]

PR Summary

• Added New Validation Message for "Extensions" Rule
  A new message will now appear when users deviate from certain file extension rules. This makes the application more user-friendly as it provides clear guidance on expected file types.

• Introduced "Hex Color" Validation Rule
  A new rule has been added to ensure hex color codes are validated. This improves the application's robustness by avoiding potential errors that might occur from invalid color inputs. With this rule, users will also benefit from guided input, improving their experience with the platform.

[askdkc]

@nshiro さん

仕事早い‼️👀

いつもありがとうございます〜🙇‍♂️