added getAll function to language

this function is useful for reducing code in the model see below
currenlty something like this in the method
               $data['text_none'] = $this->language->get('text_none');
		$data['text_yes'] = $this->language->get('text_yes');
		$data['text_no'] = $this->language->get('text_no');
               ....

now can be as easy as 
                $language_ignore=array('code','text','etc')
		$data = $this->language->getAll($language_ignore);