Hi,
First, language override in one every HikaShop versions but mad-q don't want to change the text, he wants to change the styles.
So, you have to override the HikaShop CSS or add some CSS rules in your template.
You can read more about it in our FAQ :
www.hikashop.com/en/support/documentation/faq.html#css
The checkout bar uses the class: hikashop_cart_step (with an extra class "hikashop_cart_step_current" for the current step).
After that, you can change some things in the views. The checkout bar is displayed in the view "checkout | step".
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.