Remember tab when switching locale

I've encountered a few usecases where I'd like the localelink to switch to the same tab in the other language. When an editor asked for it I decided to try and add that to the extension. See what you think!

templates/fields/_locale.twig

@@ -114,3 +114,23 @@
         background-color: transparent !important;
     }
 </style>
+
+<script>
+    var localeTab = document.querySelector('#locale-select');
+
+    if (localeTab !== null) {
+        var links = localeTab.querySelectorAll('a');
+
+        window.onhashchange = function (){
+            var tab = window.location.hash.substr(1);
+
+            Array.prototype.forEach.call(links, function(link) {
+                var origHref = link.getAttribute('href').split('#')[0];
+
+                if (tab.length>0) {
+                    link.setAttribute('href', origHref + '#' + tab);
+                }
+            });
+        };
+    }
+</script>