Lang string change to faciliate Behat and accessibility

(Bug 1431569)

There were 2 setting links on the page now they have different text.

Change-Id: I0eb09e253af173584e99a6c86ca67d52030dff41

htdocs/interaction/forum/lang/en.utf8/interaction.forum.php

@@ -79,6 +79,7 @@ To see and reply to the post online, follow this link:
 
 To unsubscribe from this %s, visit:
 %s";
+$string['forumsettings'] = 'Forum settings';
 $string['forumsuccessfulsubscribe'] = 'Forum subscribed successfully';
 $string['forumsuccessfulunsubscribe'] = 'Forum unsubscribed successfully';
 $string['gotoforums'] = 'Go to forums';

htdocs/interaction/forum/lib.php

@@ -87,7 +87,7 @@ class PluginInteractionForum extends PluginInteraction {
                 'type' => 'fieldset',
                 'collapsible' => true,
                 'collapsed' => true,
-                'legend' => get_string('settings'),
+                'legend' => get_string('forumsettings', 'interaction.forum'),
                 'elements' => array(
                     'autosubscribe' => array(
                         'type'         => 'switchbox',