I think you're underestimating. An app is a common term for a mobile or web app, should be known by most people using the app in the first place. Permissions is a common term to signify what you just gave the new app you approved, also nothing really crazy. You want to remove or revoke what you just gave the app, so that term is obvious. And the service you approved it with is Google, so add that in.
It's not like this is using any real technical terms that a common 21st century computer/phone user might not know, and the only real difficult one is probably "permissions" which you can probably either guess or eventually get to with synonyms; totally possible given it's a common English word.
It's not like this is using any real technical terms that a common 21st century computer/phone user might not know, and the only real difficult one is probably "permissions" which you can probably either guess or eventually get to with synonyms; totally possible given it's a common English word.