[4.0] Fix overflow in modal

[Quy]

Pull Request for Issue #26638.

Summary of Changes

Fix text from overflowing in modal.

Testing Instructions

Go to System > Site Templates > Cassiopeia Details and Files
Edit error.php
Click on New File
Apply PR
Run npm i

Actual result

[infograf768]

I have tested this item ✅ successfully on de80493

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[roland-d]

I have tested this item ✅ successfully on de80493

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[alikon]

RTC

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[wilsonge]

Thanks!