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To add Google translate to your entire website you need to add following code in Site header.
Click on Setting and then choose Pro settings.
2. Copy the Below Code-
<body><div id="google_translate_element" style="text-align: center;"><script type="text/javascript">function googleTranslateElementInit() {new google.translate.TranslateElement({pageLanguage: 'en', layout: google.translate.TranslateElement.InlineLayout.SIMPLE}, 'google_translate_element');}</script><script type="text/javascript" src="//translate.google.com/translate_a/element.js?cb=googleTranslateElementInit"></script></body>
3. Copy and Paste the above code into PRO setting or Site Header.
Click on Save button, make sure to Publish the changes.
Note:- You can align the Google translate button to Right, Left and Center
<body><div id="google_translate_element" style="text-align: center;"><script type="text/javascript">function googleTranslateElementInit() {new google.translate.TranslateElement({pageLanguage: 'en', layout: google.translate.TranslateElement.InlineLayout.SIMPLE}, 'google_translate_element');}</script><script type="text/javascript" src="//translate.google.com/translate_a/element.js?cb=googleTranslateElementInit"></script></body>
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If you want Translate button in right side.
<body><div id="google_translate_element" style="text-align: right;"><script type="text/javascript">function googleTranslateElementInit() {new google.translate.TranslateElement({pageLanguage: 'en', layout: google.translate.TranslateElement.InlineLayout.SIMPLE}, 'google_translate_element');}</script><script type="text/javascript" src="//translate.google.com/translate_a/element.js?cb=googleTranslateElementInit"></script></body>
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If you want Translate button in left side.
<body><div id="google_translate_element" style="text-align: left;"><script type="text/javascript">function googleTranslateElementInit() {new google.translate.TranslateElement({pageLanguage: 'en', layout: google.translate.TranslateElement.InlineLayout.SIMPLE}, 'google_translate_element');}</script><script type="text/javascript" src="//translate.google.com/translate_a/element.js?cb=googleTranslateElementInit"></script></body>