"Continuer" instead of "next" in checkout form and

-- Error-message(debug-mod must be tuned on) -- : "Continuer" instead of "next" in checkout form and on last step it shoud be " finish"

I have my checkout process using the following workflow:
[0] => login_address_shipping_coupon_payment_cart_status_fields_confirm [1] => end

will you please tell me how to change the text.
when i am printing the $this->step
it always give s me 0 so i am unable to customize the code on the base of it. please let me know the condition for this.
currently i am using
if($this->step==2){
echo $this->cart->displayButton('Continue','next',$this->params,hikashop::completeLink('checkout&task=step&step='.$this->step+1),'document.forms[\'hikashop_checkout_form\'].submit(); return false; ','id="hikashop_checkout_next_button"');
}else{
echo $this->cart->displayButton(JText::_('NEXT'),'next',$this->params,hikashop::completeLink('checkout&task=step&step='.$this->step+1),'document.forms[\'hikashop_checkout_form\'].submit(); return false;','id="hikashop_checkout_next_button"');
}


Thanks.

Please provide me solution for this..