Fix UserPassword validator translation
minor #11387 [2.3] [Validator] Fix UserPassword validator translation (redstar504)

This PR was merged into the 2.3 branch.

Discussion
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[2.3] [Validator] Fix UserPassword validator translation

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

Fixes the UserPassword translation message only for 2.3 as discussed in symfony/symfony#11383.

Commits
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73d50ed Fix UserPassword validator translation