You can use the Localization app to make these changes. Think these are the labels you are looking for but please make sure to test thoroughly and document your changes in case you need to revert to the originals...looks like you'll need too update 2 labels

If I make changes to the text in localization, will the updated text be shown to both users who attempt to log in with an expired account and those who enter incorrect credentials?

not sure...this is why it’s so important to test these changes...hopefully you have a sandbox you can try first. If not, you might want make these changes when your users are offline, just in case.

Got it! Thanks for clarifying!!

@Chelsy Koshy Based on my onboarding sessions if I remember right, it’s truly a “Find and Replace” and will list every instance that appears in the platform within that “module” as listed while searching. Because it’s listed as “standard” I would imagine it will apply everywhere regardless of the situation causing the error messages. Like @lrnlab mentioned the best way to know is to test!

Here’s an article on the Localization tool for more information as well if it’s helpful!