The feature of live translation on Skype earlier this summer is not ready for all users.
Skype Translator is a new tool that will convert video calls in English, German, French, Italian, Spanish and Mandarin and 50 messaging languages inside the Windows app.
According to the Skype, the software will learn as it is made with machine learning, and hence it will get better and better with people using it.
A new icon will be in the notice as this tool will arrive, and you will be able to use it for free.
Source: Skype Blog