[Validator] Improve UserPassword message
minor #11383 [Validator] Improve UserPassword message (redstar504)

This PR was squashed before being merged into the 2.6-dev branch (closes #11383).

Discussion
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[Validator] Improve UserPassword message

| Q             | A
| ------------- | ---
| Fixed tickets | None
| License       | MIT

This validator message is not proper English.

Commits
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d57471e [Validator] Improve UserPassword message