fix(pages): correct spelling of 'copyright' in website fields

[lwnmengjing]

Description

Checklist

• the pull request title describes what this PR does (not a vague title like Update index.md)
• the pull request targets the default branch of the repository (main)
• tests are added for the changes I made (if any source code was modified)
• documentation added or updated
• I have run the project locally and verified that there are no errors

[Copilot]

Pull Request Overview

This pull request corrects the spelling of "copyright" in website fields for the pages locale file.

• Corrects the display text for the website copyright key
• Updates the string in the English locale file

Comments suppressed due to low confidence (1)

src/locales/en-US/pages.ts:314

• [nitpick] While the display text has been corrected, consider updating the translation key to 'websiteCopyright' for consistency if this change fits with the rest of the key naming convention.

'pages.fields.websiteCopyRight': 'website copyright',