MDL-67544 mod_forum: Add missing aria label for discussion actions

mod/forum/lang/en/forum.php

@@ -691,6 +691,7 @@ $string['timedhidden'] = 'Timed status: Hidden from students';
 $string['timedposts'] = 'Timed posts';
 $string['timedvisible'] = 'Timed status: Visible to all users';
 $string['timestartenderror'] = 'Display end date cannot be earlier than the start date';
+$string['togglediscussionmenu'] = 'Toggle the discussion menu';
 $string['togglefullscreen'] = 'Toggle full screen';
 $string['togglesettingsdrawer'] = 'Toggle settings drawer';
 $string['trackforum'] = 'Track unread posts';

mod/forum/templates/forum_action_menu.mustache

@@ -56,6 +56,7 @@
         aria-haspopup="true"
         tabindex="0"
         aria-controls="forum-action-menu-{{id}}-menu"
+        aria-label="{{#str}}togglediscussionmenu, mod_forum{{/str}}"
         aria-expanded="false">
         {{#settings.togglemoreicon}}
             {{#pix}} i/menu, core{{/pix}}