Ticket #46997: 46997.4.diff

src/wp-includes/customize/class-wp-customize-theme-control.php

@@ -93 +93 @@
                                 <div class="update-message notice inline notice-warning notice-alt" data-slug="{{ data.theme.id }}">
                                         <p>
                                                 <?php
-                                                /* translators: %s: "Update now" button */
-                                                printf( __( 'New version available. %s' ), '<button class="button-link update-theme" type="button">' . __( 'Update now' ) . '</button>' );
+                                                if ( is_multisite() ) {
+                                                        _e( 'New version available.' );
+                                                } else {
+                                                        printf(
+                                                                /* translators: %s: "Update now" button */
+                                                                __( 'New version available. %s' ),
+                                                                '<button class="button-link update-theme" type="button">' . __( 'Update now' ) . '</button>'
+                                                        );
+                                                }
                                                 ?>
                                         </p>
                                 </div>