Hello EmmanuellDS,
To change the language in Microsoft Teams desktop client, please click your profile picture at the top of the app, then select Settings -> General and go to the Language section. Choose the preferred language and restart to apply the change.
If you are having problems changing the language or it wouldn’t be applied, please capture a screenshot of the interface. I want to know whether the settings would be changed while the language appears to be another language.
Regards,
Rick