Google speech api with non-english language

ahoj.txt

HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8
Content-Disposition: attachment
Date: Sun, 21 Oct 2012 20:03:54 GMT
Expires: Sun, 21 Oct 2012 20:03:54 GMT
Cache-Control: private, max-age=0
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Server: GSE
Transfer-Encoding: chunked

{"status":0,"id":"4cf5d146f677f4a95f7bb3370983fe32-1","hypotheses":[{"utterance":"ahoj ako sa máš","confidence":0.90439355},{"utterance":"ahoj ako sa maš"},{"utterance":"ahoj ako sa mas"},{"utterance":"ahoj ako samas"}]}

google-speech-api-test.bat

@echo off
set path=%path%;C:\Programs\Video\ffmpeg\bin\;C:\Data\Work\speech\curl2\

rem Convert wave to flac
ffmpeg -i ahoj.wav -acodec flac ahoj.flac

rem Make POST request with attachment, sk-SK for Slovak language, en-EN for english
curl -o ahoj.txt -k -i -X POST -H "Content-Type:audio/x-flac; rate=44100" -T ahoj.flac "https://www.google.com/speech-api/v1/recognize?xjerr=1&client=chromium&lang=sk-SK&maxresults=10&pfilter=0"