Edit error pages so we don't say "whoops"

What does this MR do and why?

Resolve Update error messages that use "Whoops..." in t... (#365208 - closed), which points out we shouldn't be too colloquial on error pages.

Screenshots or screen recordings

Before:

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.