title: Azure Custom Speech: “normalized text is empty”
body: <p>I'm trying to use the azure cognitive services, the speech to text, but as the recognition is quite bad for the language Polish, I was trying to upload the audio + transcript but then I tried every format but still give the same error:
  &quot;ID20190102_083350_43_2_78120.wav:  Error: normalized text is empty.&quot;</p>
  <p>In the file I only have this :</p>
  <p>ID20190102_083350_43_2_78120.wav    dzien</p>
  <p>I created the file by hand in notepad++ with the encode UTF-8 BOM</p>
  <p>Thanks in advance,</p>