Without explicit language param, nova-2-general falls back to multilingual
auto-detect and often misdetects arabic audio as english (phonetic transcript
'salam alaikum' instead of 'السلام عليكم'). detectLang() then sees only
latin chars and answers in english.
Confirmed via Deepgram docs: nova-2-general accepts language=ar and language=tr
(only nova-3 rejects them with HTTP 400).
nova-2 unterstützt kein ar/tr → Deepgram 400 "No such model/language/tier
combination" → leeres Transcript ("kein Text nach Speech"). nova-3 deckt alle
gelisteten Sprachen als diskrete Codes ab (de/en/tr/ar/fr/es/pt/it), ohne
Regression. Verifiziert gg. Deepgram models-languages-overview.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
