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OH NO! GET THE CRASH KART! NUMBER 10 SCALPEL! TWO BAGS OF O-NEGATIVE BLOOD! (sorry -been watching too many ER episodes recently)
Calm down. Next time, please have a normal lower-caps more descriptive title for your post, then we can help you faster.
Did you set the language to Croatian in the system admin -> preferences -> general settings page?
Did you name the folder with the Croatian language exactly like the other Croatian language folders?
Are you sure you're not looking at a cached page (browser of module cache setting in same general settings page)?
If those things are set right, it should work just fine.
Herko