I pretty sure the language file content not valid, please open public_html/language/sr-YU/sr-YU.com_community.ini
search for: COM_COMMUNITY_HERO_PARAGRAPH
it found or not?
you can provide me FTP access detail. I will show you how to resolving this issue.
the translation at /language/sr-YU/sr-YU.com_community.ini still containing many English. for example the text at community login page
COM_COMMUNITY_HERO_PARAGRAPH="Come and join our community. Expand your network and get to know new people!"
you must changing it to Serbian language, and so on for any text that still in English at Serbian language file (/language/sr-YU/sr-YU.com_community.ini).