#4192000 Jetpack Backup: Show ‘Latest backup on this day’ for dates before today

Changes proposed in this Pull Request

• (Non-mobile layouts only) When the selected date isn’t the same as the current calendar date, show “Latest backups on this day” instead of “Latest backups.”

Fixes #44530, 1164141197617539-as-1186718228515397.

Testing instructions

• For a site with Jetpack Backup, go to the Backup page on either Jetpack.com or WordPress.com, using a non-mobile screen layout.
• Observe/verify that for the current calendar date, if a backup exists, the status header reads “Latest backup” (see screenshot for example).
• Observe/verify that for every other date with a backup, the status header reads “Latest backup on this day” (see screenshot for example).

Screenshots

Previous date

“Today”