function googleTranslateElementInit() {
new google.translate.TranslateElement({
pageLanguage: 'en',
autoDisplay: 'true',
includedLanguages:'hi,en,bn,id,fr',
layout: google.translate.TranslateElement.InlineLayout.HORIZONTAL
}, 'google_translate_element');
}
If you want to add custom language to the Google Translate button, then you can easily change by using includedLanguages.