Cosmetic text improvements in tests - 1/6

What does this MR do and why?

Automatic text replacements to improve readability of text description in tests.

• replace alert banner for alert.
• replace alert message for alert.
• replace alert error for alert
• replace shows alert for shows an alert

In my opinion, the words banner, message or error don't add much. The sentences read better without them.

Screenshots or screen recordings

N/A

How to set up and validate locally

N/A

MR acceptance checklist

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