Improve description in group audit events UI

The Group Audit Events feature only displays group-level events, not
project-level events within the groupw, which is unexpected behavior
for many users. This improves the description that appears at the top
of the feature page to better explain that only group-level events will
be displayed.

ee/app/views/groups/audit_events/index.html.haml

 - page_title _('Audit Events')
 
 %h3.page-title= _('Group Audit Events')
-%p.light= _('Events in %{group_name}') % { group_name: @group.name }
+%p.light= _('Group-level events in %{group_name} (no project-level events)') % { group_name: @group.name }
 
 #js-group-audit-events-app{ data: { form_path: group_audit_events_path(@group),
   events: @table_events.to_json,

locale/gitlab.pot

@@ -9323,9 +9323,6 @@ msgstr ""
 msgid "Events"
 msgstr ""
 
-msgid "Events in %{group_name}"
-msgstr ""
-
 msgid "Events in %{project_path}"
 msgstr ""
 
@@ -11351,6 +11348,9 @@ msgstr ""
 msgid "Group was successfully updated."
 msgstr ""
 
+msgid "Group-level events in %{group_name} (no project-level events)"
+msgstr ""
+
 msgid "Group: %{group_name}"
 msgstr ""