I18N: Use a placeholder instead of the \ character in a translatable string in WP_REST_Users_Controller::check_user_password().

Props ramiy.
Fixes #50812.

git-svn-id: https://develop.svn.wordpress.org/trunk@48692 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php

@@ -1291,7 +1291,11 @@ class WP_REST_Users_Controller extends WP_REST_Controller {
 		if ( false !== strpos( $password, '\\' ) ) {
 			return new WP_Error(
 				'rest_user_invalid_password',
-				__( 'Passwords cannot contain the "\\" character.' ),
+				sprintf(
+					/* translators: %s: The '\' character. */
+					__( 'Passwords cannot contain the "%s" character.' ),
+					'\\'
+				),
 				array( 'status' => 400 )
 			);
 		}