i18n: Fix a smattering of strings that weren't getting translated.

These are some strings I spotted in English when playing around a bit
with the UI set to German, where our translations are near complete.

It'd be great to have a more systematic way of spotting this kind of
omission.  Probably a fairly simple linter could catch a lot of cases.

static/js/click_handlers.js

@@ -665,8 +665,8 @@ $(function () {
         var settings_toggle = components.toggle({
             name: "settings-toggle",
             values: [
-                { label: "Settings", key: "settings" },
-                { label: "Organization", key: "organization" },
+                { label: i18n.t("Settings"), key: "settings" },
+                { label: i18n.t("Organization"), key: "organization" },
             ],
             callback: function (name, key) {
                 $(".sidebar li").hide();

static/js/components.js

@@ -7,7 +7,7 @@ var exports = {};
         name: String toggle_name,
         selected: Integer selected_index,
         values: Array<Object> [
-            { label: String title }
+            { label: i18n.t(String title) }
         ],
         callback: function () {
             // .. on value change.

static/js/ui.js

@@ -123,9 +123,9 @@ $(document).ready(function () {
         name: "info-overlay-toggle",
         selected: 0,
         values: [
-            { label: "Keyboard shortcuts", key: "keyboard-shortcuts" },
-            { label: "Message formatting", key: "markdown-help" },
-            { label: "Search operators", key: "search-operators" },
+            { label: i18n.t("Keyboard shortcuts"), key: "keyboard-shortcuts" },
+            { label: i18n.t("Message formatting"), key: "markdown-help" },
+            { label: i18n.t("Search operators"), key: "search-operators" },
         ],
         callback: function (name, key) {
             $(".overlay-modal").hide();

templates/zerver/keyboard_shortcuts.html

@@ -241,6 +241,6 @@
       </table>
     </div>
     <hr/>
-    <a href="/help/keyboard-shortcuts" target="_blank">Detailed keyboard shortcuts documentation</a>
+    <a href="/help/keyboard-shortcuts" target="_blank">{% trans %}Detailed keyboard shortcuts documentation{% endtrans %}</a>
   </div>
 </div>