Improve various Phame UI things

Summary:
  - Clean up the menu selection states.
  - Nuke some unused code.
  - Show some more contextual error messages.
  - Improve/pht() some strings.

Test Plan: Looked at post/blog list, empty state of "new post".

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1373

Differential Revision: https://secure.phabricator.com/D3706

src/applications/phame/controller/blog/PhameBlogEditController.php

@@ -187,9 +187,14 @@ final class PhameBlogEditController
       $error_view = null;
     }
 
-    $nav = $this->renderSideNavFilterView(null);
+    $header = id(new PhabricatorHeaderView())
+      ->setHeader($page_title);
+
+    $nav = $this->renderSideNavFilterView();
+    $nav->selectFilter($this->id ? null : 'blog/new');
     $nav->appendChild(
       array(
+        $header,
         $error_view,
         $form,
       ));