Date/Time: Add indication of site language default date/time format in General Settings.

This aims to make it easier to determine which format is the default for the current locale.

Props pbearne, SergeyBiryukov.
Fixes #64102.

git-svn-id: https://develop.svn.wordpress.org/trunk@60942 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-admin/options-general.php

@@ -479,11 +479,20 @@ class="<?php echo esc_attr( $classes_for_button ); ?>"
 
 foreach ( $date_formats as $format ) {
 	echo "\t<label><input type='radio' name='date_format' value='" . esc_attr( $format ) . "'";
+
 	if ( get_option( 'date_format' ) === $format ) { // checked() uses "==" rather than "===".
 		echo " checked='checked'";
 		$custom = false;
 	}
-	echo ' /> <span class="date-time-text format-i18n">' . date_i18n( $format ) . '</span><code>' . esc_html( $format ) . "</code></label><br />\n";
+
+	echo ' /> <span class="date-time-text format-i18n">' . date_i18n( $format ) . '</span>' .
+		'<code>' . esc_html( $format ) . '</code>';
+
+	if ( __( 'F j, Y' ) === $format ) {
+		echo ' ' . __( '(Site language default)' );
+	}
+
+	echo "</label><br />\n";
 }
 
 	echo '<label><input type="radio" name="date_format" id="date_format_custom_radio" value="\c\u\s\t\o\m"';
@@ -524,11 +533,20 @@ class="<?php echo esc_attr( $classes_for_button ); ?>"
 
 foreach ( $time_formats as $format ) {
 	echo "\t<label><input type='radio' name='time_format' value='" . esc_attr( $format ) . "'";
+
 	if ( get_option( 'time_format' ) === $format ) { // checked() uses "==" rather than "===".
 		echo " checked='checked'";
 		$custom = false;
 	}
-	echo ' /> <span class="date-time-text format-i18n">' . date_i18n( $format ) . '</span><code>' . esc_html( $format ) . "</code></label><br />\n";
+
+	echo ' /> <span class="date-time-text format-i18n">' . date_i18n( $format ) . '</span>' .
+		'<code>' . esc_html( $format ) . '</code>';
+
+	if ( __( 'g:i a' ) === $format ) {
+		echo ' ' . __( '(Site language default)' );
+	}
+
+	echo "</label><br />\n";
 }
 
 	echo '<label><input type="radio" name="time_format" id="time_format_custom_radio" value="\c\u\s\t\o\m"';