Add some more UI reminder text about draft revisions

Summary: See PHI433. This beefs up reminder texts for drafts a little bit since some users in the wild aren't always seeing/remembering the existing, fairly subtle hints.

Test Plan: Created a reivsion with `--draft`, viewed it, saw richer reminders.

Differential Revision: https://secure.phabricator.com/D19204

src/applications/differential/constants/DifferentialRevisionStatus.php

@@ -172,10 +172,10 @@ final class DifferentialRevisionStatus extends Phobject {
         'name' => pht('Draft'),
         // For legacy clients, treat this as though it is "Needs Review".
         'legacy' => 0,
-        'icon' => 'fa-file-text-o',
+        'icon' => 'fa-spinner',
         'closed' => false,
-        'color.icon' => 'grey',
+        'color.icon' => 'pink',
-        'color.tag' => 'grey',
+        'color.tag' => 'pink',
         'color.ansi' => null,
       ),
     );

src/applications/differential/customfield/DifferentialDraftField.php

@@ -37,9 +37,14 @@ final class DifferentialDraftField
     }
 
     // If the author has held this revision as a draft explicitly, don't
-    // show any misleading messages about it autosubmitting later.
+    // show any misleading messages about it autosubmitting later. We do show
+    // reminder text.
     if ($revision->getHoldAsDraft()) {
-      return array();
+      return array(
+        pht(
+          'This is a draft revision that has not yet been submitted for '.
+          'review.'),
+      );
     }
 
     $warnings = array();
@@ -93,4 +98,19 @@ final class DifferentialDraftField
     return $warnings;
   }
 
+  public function getWarningsForDetailView() {
+    $revision = $this->getObject();
+
+    if (!$revision->isDraft()) {
+      return array();
+    }
+
+    return array(
+      pht(
+        'This revision is currently a draft. You can leave comments, but '.
+        'no one will be notified until the revision is submitted for '.
+        'review.'),
+    );
+  }
+
 }

src/applications/differential/editor/DifferentialRevisionEditEngine.php

@@ -71,6 +71,14 @@ final class DifferentialRevisionEditEngine
     return pht('Revision');
   }
 
+  protected function getCommentViewButtonText($object) {
+    if ($object->isDraft()) {
+      return pht('Submit Quietly');
+    }
+
+    return parent::getCommentViewButtonText();
+  }
+
   protected function getObjectViewURI($object) {
     return $object->getURI();
   }