Locale: declare the $month_genitive field on WP_Locale.

See #37771.


git-svn-id: https://develop.svn.wordpress.org/trunk@38316 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-locale.php

@@ -59,6 +59,14 @@ class WP_Locale {
 	 */
 	public $month;
 
+	/**
+	 * Stores the translated strings for the month names in genitive case, if the locale specifies.
+	 *
+	 * @since 4.4.0
+	 * @var array
+	 */
+	public $month_genitive;
+
 	/**
 	 * Stores the translated strings for the abbreviated month names.
 	 *