DOC-18493 Internationalize the date and time string

[jacobfeddersen-wf]

Motivation

Internationalize the date and time string. Really this is just internationalizing the comma between the parts.

Changes

We previously internationalized the Yesterday and Today messages. The date and time string is already using intl methods to format the date and time portions of the string, but is using a static ${date}, ${time} composition to combine them. Move that string to a parameterized internationalization string.

This may not actually be necessary, but my understanding is that not all languages would necessarily use the same punctuation to combine these two parts.

Release Notes

Review

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QA Checklist

• Tests were updated and provide good coverage of the changeset and other affected code
• Manual testing was performed if needed
  • Steps from PR author: CI passing
  • Anything falling under manual testing criteria outlined in CONTRIBUTING.md

Merge Checklist

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• A Frontend Architecture member has reviewed these changes
• There are no unaddressed comments - this check can be automated if reviewers use the "Request Changes" feature
• For release PRs - Version metadata in Rosie comment is correct