Fix some HTML problems

Summary: I'm too lazy to attaching them for diffs where they were introduced.

Test Plan:
/
/D1, wrote comment with code snippet
DarkConsole
commit detail, wrote comment
task detail, wrote comment

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2432

Differential Revision: https://secure.phabricator.com/D4911

src/applications/ponder/controller/PonderQuestionAskController.php

@@ -74,14 +74,13 @@ final class PonderQuestionAskController extends PonderController {
         id(new AphrontFormSubmitControl())
         ->setValue('Ask Away!'));
 
-    $preview =
+    $preview = hsprintf(
       '<div class="aphront-panel-flush">'.
         '<div id="question-preview">'.
-          '<span class="aphront-panel-preview-loading-text">'.
-            pht('Loading question preview...').
-          '</span>'.
+          '<span class="aphront-panel-preview-loading-text">%s</span>'.
         '</div>'.
-      '</div>';
+      '</div>',
+      pht('Loading question preview...'));
 
     Javelin::initBehavior(
       'ponder-feedback-preview',