refactor: Extract settings_toggle.js.

This mostly moves code, and we also abandon the lookup mechanism
for finding our toggler.

static/js/settings_toggle.js

@@ -0,0 +1,50 @@
+var settings_toggle = (function () {
+
+var exports = {};
+
+var toggler;
+
+exports.highlight_toggle = function (tab_name) {
+    if (toggler) {
+        toggler.goto(tab_name, { dont_switch_tab: true });
+    }
+};
+
+exports.create_toggler = function () {
+    toggler = components.toggle({
+        name: "settings-toggle",
+        values: [
+            { label: i18n.t("Settings"), key: "settings" },
+            { label: i18n.t("Organization"), key: "organization" },
+        ],
+        callback: function (name, key, payload) {
+            $(".sidebar li").hide();
+
+            if (key === "organization") {
+                $("li.admin").show();
+                if (!payload.dont_switch_tab) {
+                    $("li[data-section='organization-profile']").click();
+                }
+            } else {
+                $(".settings-list li:not(.admin)").show();
+                if (!payload.dont_switch_tab) {
+                    $("li[data-section='your-account']").click();
+                }
+            }
+        },
+    });
+
+    $("#settings_overlay_container .tab-container").append(toggler.get());
+};
+
+exports.initialize = function () {
+    i18n.ensure_i18n(exports.create_toggler);
+};
+
+return exports;
+
+}());
+
+if (typeof module !== 'undefined') {
+    module.exports = settings_toggle;
+}