[FIX] website: use currentTarget onLangChangeClick

Before this commit, in case of Google Translate is enable, some content
can be wrapped in extra node.

Use currentTarget is more secure to get the right element clicked.

**Steps to reproduce:**
1. Add a website and multiple language
2. Create a page in 2 languages
3. Visit the website in Chrome and enable the translation by Google translate
4. Change the language and you should get an error similar to:

Error:
Uncaught TypeError: Cannot read property 'replace' of undefined

closes odoo/odoo#61116

Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>

addons/website/static/src/js/content/website_root.js

@@ -102,7 +102,7 @@ var WebsiteRoot = publicRootData.PublicRoot.extend({
     _onLangChangeClick: function (ev) {
         ev.preventDefault();
 
-        var $target = $(ev.target);
+        var $target = $(ev.currentTarget);
         // retrieve the hash before the redirect
         var redirect = {
             lang: $target.data('url_code'),

doc/cla/individual/pfranck.md

+Vietnam, 2020-11-02
+
+I hereby agree to the terms of the Odoo Individual Contributor License
+Agreement v1.0.
+
+I declare that I am authorized and able to make this agreement and sign this
+declaration.
+
+Signed,
+
+Franck Plazanet franck@plazanet.ovh https://github.com/pfranck