Computer Configuration > Administrative Templates > Microsoft Edge
Both
HKLM\Software\Policies\Microsoft\Edge
Enables the integrated Microsoft translation service on Microsoft Edge. If you enable this policy, Microsoft Edge offers to translate a webpage by showing an integrated translate flyout when the language detected on a webpage isn't listed under preferred languages. A translate option is available on the right-click context menu. Users can also translate selected text on a webpage via the right-click context menu, or on a PDF via the PDF toolbar and the right-click context menu. If you don't configure this policy, the policy is enabled by default. Users can choose whether to use the translation functionality or not. You can disable this policy to disable all built-in translate features.