Don't use deprecated $app->getCfg in the frontend modules

### What this PR do
This PR remove the deprecated usage of:
JFactory::getApplication()->getCfg()
at the frontend modules.

### How To test

Please make sure that the following frontend modules still works as bevor:
* (mod_finder)
* mod_footer
* mod_languages
* mod_menu
* mod_search
* mod_stats

### Tracker
JC Tracker:
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=33694&start=0