Bug #1262477 First column in Inbox should have a hidden header been added

Change-Id: Iab19f206b0f5bc46ff5d9f41b91cb08af6b79f51
Signed-off-by: logan walker <avkiwi@icloud.com>

htdocs/lang/en.utf8/activity.php

@@ -29,6 +29,7 @@ $string['type'] = 'Activity type';
 $string['attime'] = 'at';
 $string['prefsdescr'] = 'If you select either of the email options, notifications will still arrive in your inbox, but they will be automatically marked as read.';
 
+$string['messagetype'] = 'Message type';
 $string['subject'] = 'Subject';
 $string['date'] = 'Date';
 $string['read'] = 'Read';

htdocs/theme/raw/templates/account/activity/index.tpl

@@ -16,7 +16,7 @@
 			<table id="activitylist" class="fullwidth">
 				<thead>
 					<tr>
-						<th></th>
+						<th><span class="accessible-hidden">{str section='activity' tag='messagetype'}</span></th>
 						<th>{str section='activity' tag='subject'}</th>
 						<th>{str section='activity' tag='date'}</th>
 						<th class="center">{str section='activity' tag='read'}<br><a href="" onclick="toggleChecked('tocheckread'); return false;">{str section='activity' tag='selectall'}</a></th>