You can using this script to change required notification in text field

Changed Notifications on Text Field

<form id="form" onsubmit="return(login())">
<input name="username" placeholder="Username" required title="Username Anda" oninvalid="this.setCustomValidity('Username harus diisi')" 
onchange="this.setCustomValidity('')" type="text" />
<input name="pass"  type="password" placeholder="Password" oninvalid="this.setCustomValidity('Password harus diisi')" onchange="this.setCustomValidity('')" required />
<br/>Remember me: <input type="checkbox" name="remember" value="true" /><br/>
<input type="submit" name="submit" value="Log In"/>