If you haven't already closed Edge in panic thinking your PC has been compromised or you have just clicked the button you can save yourself some anxiety by clicking on the down arrow and selecting your preferred language. Click on the blue button (Ok). This will reset your language to your chosen language.
If you were not able to change the language at the start don't fear. The solution is quite simple. Open Edge if not already open. Click the gear icon now on the left side of the page.
Then select your preferred language. Click the blue button (Ok)
Edge is set back to your normal language choice.
Did this work for you?