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In LanguageConverter.php in getPreferredVariant() function occured hardcoded 'zh-' reference (string 
117):
$zh = strstr($header, 'zh-');

This is preventing use the code for other languages but zh

It should look like:
$zh = strstr($header, $mMainLanguageCode.'-');

where $mMainLanguageCode normally give LanguageXx from call like:
$this->mConverter = new KkConverter($this, 'kk', $variants, $variantfallbacks ); 

'kk' may changed to 'sr', 'zh' etc