Accessibility: Media: 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 audrasjb, afercia.
Fixes #47893.
Built from https://develop.svn.wordpress.org/trunk@46085


git-svn-id: http://core.svn.wordpress.org/trunk@45897 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/meta-boxes.php

@@ -380,18 +380,18 @@ function attachment_submit_meta_box( $post ) {
 <div id="misc-publishing-actions">
 	<div class="misc-pub-section curtime misc-pub-curtime">
 		<span id="timestamp">
-		<?php
-			$date = date_i18n(
+			<?php
+			$uploaded_on = sprintf(
+				/* translators: Publish box date string. 1: Date, 2: Time. See https://secure.php.net/date */
+				__( '%1$s at %2$s' ),
 				/* translators: Publish box date format, see https://secure.php.net/date */
-				__( 'M j, Y @ H:i' ),
-				strtotime( $post->post_date )
+				date_i18n( _x( 'M j, Y', 'publish box date format' ), strtotime( $post->post_date ) ),
+				/* translators: Publish box time format, see https://secure.php.net/date */
+				date_i18n( _x( 'H:i', 'publish box time format' ), strtotime( $post->post_date ) )
 			);
-			printf(
-				/* translators: Attachment information. %s: Date the attachment was uploaded. */
-				__( 'Uploaded on: %s' ),
-				'<b>' . $date . '</b>'
-			);
-		?>
+			/* translators: Attachment information. %s: Date the attachment was uploaded. */
+			printf( __( 'Uploaded on: %s' ), '<b>' . $uploaded_on . '</b>' );
+			?>
 		</span>
 	</div><!-- .misc-pub-section -->
 

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-46084';
+$wp_version = '5.3-alpha-46085';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.