Allow administrators to edit the "Account" panel for mailing lists and bots

Summary:
Ref T8387. Ref T6367. This allows selection of a language, which will be respected in email delievered to the list users.

For example, you could have a German list that gets mail in German or something. I don't know that the feature is really useful, it's mostly just for completeness.

I also supported it for bots, mostly so their pronouns can be configured.

Test Plan: {F468186}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T6367, T8387

Differential Revision: https://secure.phabricator.com/D13136

src/applications/settings/panel/PhabricatorAccountSettingsPanel.php

@@ -14,8 +14,13 @@ final class PhabricatorAccountSettingsPanel extends PhabricatorSettingsPanel {
     return pht('Account Information');
   }
 
+  public function isEditableByAdministrators() {
+    return true;
+  }
+
   public function processRequest(AphrontRequest $request) {
-    $user = $request->getUser();
+    $viewer = $this->getViewer();
+    $user = $this->getUser();
     $username = $user->getUsername();
 
     $errors = array();
@@ -74,7 +79,7 @@ final class PhabricatorAccountSettingsPanel extends PhabricatorSettingsPanel {
 
     $form = new AphrontFormView();
     $form
-      ->setUser($user)
+      ->setUser($viewer)
       ->appendChild(
         id(new AphrontFormSelectControl())
           ->setOptions($translations)