@EMAD_4729 I believe you want to use the Azure translator translate functionality as per your question and are concerned about its security.
All security features of Azure translator are governed by the cognitive services security guidelines. Cognitive services encryption protects your data at rest and azure Cognitive services encrypts your data as it's written in our datacenters, and automatically decrypts it for you as you access it. By default, data in the Cognitive services account is encrypted using Microsoft Managed Keys. You may choose to bring your own key.
I hope this information helps you to get started with Azure translator services. Thanks!!