Shopping cart problem (text_cart)

Hi, This make me totally crazy!

I have problem with my language (Finnish). I guess there is some bug with Opencart...or my mind.

If you go to my site: http://demokauppa.mediapit.fi and add to cart some product. Then when you go to Shopping cart, you see links: View cart and Checkout. Everything seems to be fine with english-language. BUT when I choose finnish-language and go to the Shopping cart there is appearing some bug. If you have time to notice and regognize, there you could see first text Ostoskori (Ostoskori=mean in english shopping cart) and after about 0,3 seconds it has changed to Text_cart. What could be wrong? Is there some bug or how can I fix this problem? Please could you help me.

I use version 1.5.5.1. Also I have tested with 1.5.2 and same problem.

ps. I hope you have time to see what I mean.

You need to open up your language file and make sure that the string is there. Clearly it is not because you are getting text_cart