Accessibility: Comments: Replace @ with at in the displayed date format.

The `@` symbol makes sense in the context of email addresses, but does not have a universal meaning in the context of dates.

Props birgire, afercia, audrasjb, SergeyBiryukov.
Fixes #47893.

git-svn-id: https://develop.svn.wordpress.org/trunk@46084 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/script-loader.php

@@ -1615,7 +1615,7 @@ function wp_default_scripts( &$scripts ) {
 			array(
 				'submittedOn' => __( 'Submitted on:' ),
 				/* translators: 1: Month, 2: Day, 3: Year, 4: Hour, 5: Minute. */
-				'dateFormat'  => __( '%1$s %2$s, %3$s @ %4$s:%5$s' ),
+				'dateFormat'  => __( '%1$s %2$s, %3$s at %4$s:%5$s' ),
 			)
 		);