Minor tweaks to the moderation content pane

## Ready State: Yes

Contains minor tweaks to the "needs review" pane on content dashboard.

## Requirements & Dependencies

None

## Deployment Instructions

* Merge code.
* Enable module `imagex_workflow`
* Clear caches with `drush cache-clear all`

## Usage/Test Instructions

* Go to /admin/content/dashboard ensure the "needs review" pane as a more link & empty text by default