Update what's new message for 2.10

[nwmac]

Summary

Fixes #12083

Occurred changes and/or fixed issues

Updated the what's new message for 2.10 and updated the version number in the link.

See screenshot.

Kept the message short - Learn more about the improvements and new capabilities in this version and read about the UI framework migration in 2.10

We will need to update the docs with more information.

To test, log in and view the updated banner on the home page. If it is hidden, click on the three dots icon in the top-right of the page and click on 'Restore hidden cards'.

I have updated the version number in the Chinese translation but not the message. This translation will be removed at a later date/time.

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

[nwmac]

@kwwii FYI on the text used

[gaktive]

LGTM as a headline. We can work with Write Club on what additional details will be in the release notes.