If you receive a message in another language on your desktop PC, select More options 
> Translate at the top of the message. This will show a translation of the message into the language that you've set for Teams.
Note: If you don't see the translate option in Teams, contact your IT admin to make sure that it's turned on.
Supported languages
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Arabic
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Bulgarian
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Catalan
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Chinese (Simplified)
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Chinese (Traditional)
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Croatian
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Czech
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Danish
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Dutch
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English
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Estonian
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Finnish
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French
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German
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Greek
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Hebrew
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Hungarian
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Indonesian
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Italian
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Japanese
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Korean
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Lithuanian
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Norwegian
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Polish
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Portuguese
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Romanian
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Russian
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Slovak
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Slovenian
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Spanish
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Swedish
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Thai
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Turkish
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Ukrainian
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Vietnamese
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Welsh
If you receive a message in another language on your iOS or Android mobile device, press and hold the message and then tap Translate.
To return a translated message to the original language, press and hold the message and then tap See original (language).
To set the language that you want messages translated to, tap Settings > Translation and then choose a language.
Notes:
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Chat and channel message translation in Teams for both Apple iOS and Android OS mobile devices is now available with the latest release.
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If you don't see the translate option in Teams, contact your IT admin to make sure that it's turned on.
Supported Languages
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Afrikaans
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Arabic
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Arabic, Levantine SM
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Bangla
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Bosnian (Latin)
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Bulgarian
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Cantonese (Traditional)
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Catalan
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Chinese Simplified
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Chinese Traditional
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Croatian
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Czech
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Danish
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Dutch
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English
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Estonian
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Fijian
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Filipino
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Finnish
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French
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German
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Greek
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Gujarati
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Haitian Creole
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Hebrew
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Hindi
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Hmong Daw
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Hungarian
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Icelandic
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Indonesian
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Irish
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Italian
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Japanese
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Kannada
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Kazakh
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Korean
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Latvian
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Lithuanian
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Malagasy
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Malay
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Malayalam
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Maltese
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Maori
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Marathi
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Norwegian
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Persian
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Polish
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Portuguese (Brazil)
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Portuguese (Portugal)
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Punjabi
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Queretaro Otomi
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Romanian
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Russian
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Samoan
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Serbian (Cyrillic)
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Serbian (Latin)
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Slovak
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Slovenian
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Spanish
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Swahili
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Swedish
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Tahitian
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Tamil
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Telugu
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Thai
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Tongan
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Turkish
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Ukrainian
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Urdu
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Vietnamese
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Welsh
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Yucatec Maya
