Ticket #43028: 43028.patch

wp-includes/customize/class-wp-customize-date-time-control.php

@@ -198 +198 @@
                         $month_text = $wp_locale->get_month_abbrev( $wp_locale->get_month( $i ) );
 
                         /* translators: 1: month number (01, 02, etc.), 2: month abbreviation */
-                        $months[ $i ]['text']  = sprintf( __( '%1$s-%2$s' ), $i, $month_text );
+                        $months[ $i ]['text']  = sprintf($month_text);
                         $months[ $i ]['value'] = $i;
                 }
                 return array(