Hello, I wonder why firefox doesn't have a Bulgarian translation in Linux Mint, when you can download FF in Bulgarian for Linux from the official website.
Have you got the language-support-bg package installed (and possibly language-pack-bg)?
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sorry for not coming back to this sooner, but have you logged into a bulgarian session? Most apps will pick up the language to use from global variables.
If you have a question that has been answered and solved, then please edit your original post and put a [SOLVED] at the end of your subject header Hint - use a google search including the search term site:forums.linuxmint.com