Hello RDBainbridge,
Thank you for using Apple Support Communities.
We understand that you are not able to use the Translate app on your iPhone. The icons for microphone and text are not appearing on your screen. The first thing that we would recommend is to review the following support article to make sure that you are not missing anything crucial:
How to use Translate on your iPhone
If you are still not able to use the app, you can delete and restore the app on your iPhone. This article will guide you through this:
Delete built-in Apple apps from the Home screen on your iOS 14 or iPadOS device or Apple Watch
Best regards.