New help center: date picker language not aligned with Jira settings

Summary

• When using the new help center in a non-English language, the language in the date picker is displaying in English
• On the old help center, the name of the day/month is translated correctly
   

  Environment

• Jira Service Desk
• "new help center" enabled

Steps to Reproduce

1. Navigate to the customer profile page by clicking on the user's avatar > Profile(https://<instance_name>.atlassian.net/servicedesk/customer/user/profile) and change the language to a non-english language
2. Create a new request in the help center

Expected Results

• The calendar is displayed in the correct language

Actual Results

• The calendar is displayed in English
• Not highlighted in the screenshot, but the days are also in English

Old help center	New help center

Notes

• This issues only happen in the "new help center"
• In the example above, the "Use ISO8601 standard in Date Picker" setting is set to "Yes". The "Use ISO8601 standard in Date Picker" setting also has no effect on the date picker in the "new help center"; Jira settings > System > Look and feel(https://<instance_name>.atlassian.net/secure/admin/LookAndFeel!default.jspa)

Workaround

This Workaround is obsolete

• Turn off the "new help center": Navigate to Project Settings > Portal Settings > View and customize; under "Try the new help center", put the toggle switch into the "off" position.  Please quote this bug ticket number in the feedback form.