You can add a dictionary based on the Keyboard that you have added. See the pic below. Dictation may not be available for all languages
You can have multiple dictionary on one device
Dictionary Support
Dictation languages
English (Australia, Canada, India, Ireland, Malaysia, New Zealand, Philippines, Saudi Arabia, Singapore, South Africa, United Arab Emirates, UK, US), Cantonese (China mainland, Hong Kong), Mandarin Chinese (China mainland, Taiwan), French (Belgium, Canada, France, Luxembourg, Switzerland), German (Austria, Germany, Switzerland), Italian (Italy, Switzerland), Japanese, Korean, Spanish (Chile, Colombia, Mexico, Spain, US), Portuguese (Brazil, Portugal), Arabic (Kuwait, Qatar, Saudi Arabia, United Arab Emirates), Catalan, Croatian, Czech, Danish, Dutch (Belgium, Netherlands), Finnish, Greek, Hebrew, Hindi, Hungarian, Indonesian, Malay, Norwegian (Bokmål), Polish, Romanian, Russian, Shanghainese (China mainland), Slovak, Swedish, Thai, Turkish, Ukrainian, Vietnamese
Monolingual dictionary support
English (UK, US), Chinese (Simplified, Traditional, Traditional – Hong Kong), Danish, Dutch, French, German, Hebrew, Hindi, Italian, Japanese, Korean, Norwegian, Portuguese, Russian, Spanish, Swedish, Thai, Turkish, Bulgarian, Catalan, Greek, Malay, Polish, Punjabi, Romanian
Idiom dictionary support
Simplified Chinese, Traditional Chinese–English, Cantonese–English
Bilingual dictionary support
Arabic – English, Bangla – English, Cantonese (Traditional) – English, Chinese (Simplified) – English, Chinese (Simplified) – Japanese, Croatian – English, Czech – English, Danish – English, Dutch – English, Finnish – English, French – English, French – German, German – English, Greek – English, Gujarati – English, Hindi – English, Hungarian – English, Indonesian – English, Italian – English, Japanese – English, Kannada – English, Kazakh – English, Korean – English, Malay – English, Malayalam – English, Norwegian – English, Polish – English, Portuguese – English, Punjabi – English, Russian – English, Slovak – English, Spanish – English, Swedish – English, Tamil – English, Telugu – English, Thai – English, Turkish – English, Ukrainian – English, Urdu – English, Vietnamese – English
Thesaurus
English (UK, US), Chinese (Simplified)