Ticket #34554: 34554.patch

src/wp-includes/taxonomy-functions.php

@@ -540 +540 @@
         );
         $nohier_vs_hier_defaults['menu_name'] = $nohier_vs_hier_defaults['name'];
 
-        return _get_custom_object_labels( $tax, $nohier_vs_hier_defaults );
+        $labels = _get_custom_object_labels( $tax, $nohier_vs_hier_defaults );
+
+        $taxonomy = $tax->name;
+
+        $default_labels = clone $labels;
+
+        /**
+         * Filter the labels of a specific taxonomy.
+         *
+         * The dynamic portion of the hook name, `$taxonomy`, refers to
+         * the taxonomy slug.
+         *
+         * @since 4.4.0
+         *
+         * @see get_taxonomy_labels() for the full list of labels.
+         *
+         * @param object $labels Object with labels for the taxonomy as member variables.
+         */
+        $labels = apply_filters( "taxonomy_labels_{$taxonomy}", $labels );
+
+        // Ensure that the filtered labels contain all required default values.
+        $labels = (object) array_merge( (array) $default_labels, (array) $labels );
+
+        return $labels;
 }
 
 /**