Bug 1834576: Content overview report contains negative number

Sponsored by The Australian National University

behatnotneeded

Change-Id: I805ee159f09bdcf5ea902176c1dc43d73617b7bc

htdocs/lang/en.utf8/help/forms/content.modified.html

@@ -2,5 +2,6 @@
 <!-- @copyright For copyright information on Mahara, please see the README file distributed with this software. -->
 <h3>Modified</h3>
 <p>
-Sum of all items that were modified during the selected time period.
-</p>
+This shows the sum of all items that were modified during the selected time period.</p>
+<p>
+A negative number indicates that more items were removed than added or edited.</p>

htdocs/theme/raw/templates/admin/contentstats.tpl

 {foreach from=$data item=item key=key}
   <tr class="{cycle values='r0,r1'}">
     {if $columns.rownum}<td>{$offset + $dwoo.foreach.default.iteration}</td>{/if}
-    {if $columns.name}<td><a href="statistics.php?{if $institution}institution={$institution}&{/if}type=content&subtype=historical&field={$item->field}">{str tag=$item->field section=statistics}</a></td>{/if}
+    {if $columns.name}<td>{str tag=$item->field section=statistics}</td>{/if}
     {if $columns.modified}<td>{$item->modified}</td>{/if}
     {if $columns.total}<td class="center">{$item->value}</td>{/if}
   </tr>