allow language to be set from URL parameter

Author: titusfortner

static/js/tabpane-persist.js

@@ -1,5 +1,14 @@
 if (typeof Storage !== 'undefined') {
-    const activeLanguage = localStorage.getItem('active_language');
+    var activeLanguage = localStorage.getItem('active_language');
+
+    const params = new Proxy(new URLSearchParams(window.location.search), {
+        get: (searchParams, prop) => searchParams.get(prop),
+    });
+
+    if (params.language !== null) {
+        activeLanguage = params.language
+    }
+
     if (activeLanguage) {
         document
             .querySelectorAll('.persistLang-' + activeLanguage)