1.) Go to Settings > Administration > Languages.
Once you go there you will see a list of languages available for you to enable and the status of each:

You can enable or disable multiple languages as you wish. This allows you to change languages in Microsoft Dynamics 365.
2.) Select the language(s) you wish to enable, and/or deselect the languages you wish to disable, then click Apply.
So in this example, I have chosen Chinese (Taiwan) and have enabled the language. Usually, it takes about 20 minutes to enable a language.
I hope this helps!
Ruskin | MS Dynamics 365 & plans and pricing of Microsoft Teams