fix nav-sections to be open when active; show error if customer has no (email)domain assigned when trying to add a new address

Signed-off-by: Michael Kaufmann <d00p@froxlor.org>

lng/lng_references.php

@@ -40,3 +40,4 @@ $lng['menue']['logger']['logger'] = $lng['admin']['loggersystem'];
 
 $lng['serversettings']['default_sslvhostconf']['description'] = $lng['serversettings']['default_vhostconf']['description'];
 $lng['admin']['include_ownvhostsettings'] = $lng['serversettings']['includedefault_sslvhostconf'];
+$lng['error']['noemaildomainaddedyet'] = $lng['emails']['noemaildomainaddedyet'];