Re-use earlier retrieved internationalization string.

src/net/java/sip/communicator/impl/protocol/irc/OperationSetPersistentPresenceIrcImpl.java

@@ -75,8 +75,7 @@ private ContactGroupIrcImpl getNonPersistentGroup()
 
         ContactGroupIrcImpl volatileGroup =
             new ContactGroupIrcImpl(this.parentProvider, this.rootGroup,
-                IrcActivator.getResources().getI18NString(
+                groupName);
-                    "service.gui.NOT_IN_CONTACT_LIST_GROUP_NAME"));
 
         this.rootGroup.addSubGroup(volatileGroup);