Simple Catch Translation

Hello, is there a way to translate content on the page from english to croatian ? For example: my calendar widget and archive widget are set to english and under the post title there is "no comment" and the date also set to english and I want them to be set to croatian... and also some other things I want to translate to croatian but I cannot find a way I could manage to do that. Link: http://www.zupa-bezgresnog-zaceca-bdm.hr/ Thank you a lot for your help, Filip