Is your app running in Brazilian Portugese? In general system dialogs will display in the language of the running app in order to prevent mixed localisation. So, if your app is running in English then the system will display dialogs in English to match.
You have to make sure that the system knows that your app is running in Brazilian Portugese. QA1828 How iOS Determines the Language For Your App explains that process.
It’s possible that there’s a bug with alternate icon alert such that it’s not picking up your app’s localisation. This wouldn’t be the first time I’ve seen a problem like that. However, I just run a simple test of this here in my office and it worked for me.
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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"
I added pt_BR language support in the project and it displays the message correctly in portuguese!