Tighten profile restriction feature

- Prevent feed access to restricted profiles
- Rework display of restricted profiles with a redirect to the profile/restricted route
- Normalize permission checking with IHandleUserSession->isAuthenticated
- Remove unusable "nocache" parameter in feed module because session isn't initialized
- Reword setting name and description

src/Module/Calendar/Show.php

@@ -91,7 +91,7 @@ class Show extends BaseModule
 
 			$this->page['aside'] .= Widget\CalendarExport::getHTML($this->session->getLocalUserId());
 		} else {
-			$owner = Event::getOwnerForNickname($this->parameters['nickname'], true);
+			$owner = Event::getOwnerForNickname($this->parameters['nickname']);
 
 			Nav::setSelected('calendar');