Old Microsoft Edge browser doesn’t have Translation feature aka Microsoft Translator built-in, you need to install official extension available on Store for that. After switching to Chromium, with Chrome using Google Translate, Microsoft apart from turning off some Google services in Edge Chromium, is integrating its translate feature into the browser.
Chromium-based Edge Canary to get Microsoft Translator soon
As seen on Reddit, the feature is already available for some users using Canary version of Edge insider build, when this was asked by a user in Microsoft Edge insider forum, Microsoft employee Amitkun, confirmed the feature will be rolled out to all users running Edge Canary by the end of this month.
“There is nothing additional you need to do get translate. Translate feature rollout is under progress and by end of the month all canary users should have it”
Vivaldi, Opera, and Brave don’t offer translation feature because they don’t own one. When coming to Firefox, once we reported browser will to use Microsoft Translator and recently Mozilla added Google Translation API to Firefox, in reality, neither they are shipped or nor available to users.
As Google integrated Google Translate service in Chrome, MS now integrating its Translator into Edge powered by Chromium. There is a clear difference between users translating pages manually by using extension and pages being translated by the browser, in our opinion, this may make these two –Chrome and Edge Chromium– to stay top on other browsers.

And for the first time, as appears in the screenshot above, there will be a setting “Offer to translate pages that aren’t in a language you read” in Languages Settings that allows users to turn Translation feature on or off in Edge browser.
Like Chrome, new Edge browser to also show an icon in the address bar and asks to translate foreign language pages to default language set in the browser, which is Generally English for most users.