We dont support Slovenian language. My guess on this is that that symbol needs a specific character set loaded and since VBulletin and our program do not have or support that language.
Problem is most European languages use the iso-8859-1 charset as does english. I beleive Slovenian requires iso-8859-2. I suppose you can modify both programs but I do not know what specific problems you will have if you do so.
You can modify the inc-photopost.php file and I beleive this is the line your looking for
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