Add zh hant language

[Infinirc-RickyChen]

Summary

Add Traditional Chinese (zh-Hant) localization support to Rancher Dashboard

Fixes: #13415

Occurred changes and/or fixed issues

• Added Traditional Chinese language support to the Rancher Dashboard UI
• Created new language file shell/assets/translations/zh-hant.yaml
• Added Traditional Chinese translations for harvester-manager package
• Updated language selection menu to include Traditional Chinese option
• Ensured consistent translation of technical terms across the UI

Technical notes summary

• Added new locale code 'zh-Hant' with proper language configuration
• Maintained existing translation structure for consistency
• Ensured proper handling of special characters and formatting
• Followed existing i18n implementation patterns

Screenshot/Video

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes

[richard-cox]

@a110605 would you be able to review or locate someone who can confirm the translations are ok (mainly that there's nothing controversial or inappropriate and that they are roughly correct)?

[richard-cox]

how come this was needed?

[richard-cox]

it looks like this and a few other similar changes below are reverts of recent changes