made changes to username availability message

Author: aastha-mittal

public/src/client/register.js

@@ -116,11 +116,12 @@ define('forum/register', [
 
 	function validateUsername(username, callback) {
 		callback = callback || function () {};
-
+	
 		const username_notify = $('#username-notify');
 		username_notify.text('');
 		const usernameInput = $('#username');
 		const userslug = slugify(username);
+	
 		if (username.length < ajaxify.data.minimumUsernameLength || userslug.length < ajaxify.data.minimumUsernameLength) {
 			showError(usernameInput, username_notify, '[[error:username-too-short]]');
 		} else if (username.length > ajaxify.data.maximumUsernameLength) {
@@ -135,13 +136,19 @@ define('forum/register', [
 				if (results.every(obj => obj.status === 'rejected')) {
 					showSuccess(usernameInput, username_notify, successIcon);
 				} else {
-					showError(usernameInput, username_notify, '[[error:username-taken]]');
+					const suggestion = username + '123';
+					showError(
+						usernameInput,
+						username_notify,
+						`[[error:username-taken]] — try "<strong>${suggestion}</strong>"`
+					);
 				}
-
+	
 				callback();
 			});
 		}
 	}
+	
 
 	function validatePassword(password, password_confirm) {
 		const passwordInput = $('#password');