bugfix
	modified:   application/models/DbTable/Waermetauscher.php
	modified:   application/models/DbTable/WaermetauscherUnterkategorie.php
	modified:   application/models/Waermetauscher.php
	modified:   application/models/WaermetauscherMapper.php
	modified:   application/models/WaermetauscherUnterkategorie.php
	modified:   application/views/scripts/index/index.phtml