[Validators] Fixed failing tests requiring ICU 52.1 which are skipped otherwise
bug #11695 [Validators] Fixed failing tests requiring ICU 52.1 which are skipped otherwise (webmozart)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #11695).

Discussion
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[Validators] Fixed failing tests requiring ICU 52.1 which are skipped otherwise

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

I just ran the tests with ICU 52.1 installed and noticed that a few of them failed. This PR fixes these tests.

Commits
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5440ed5 [Validators] Fixed failing tests requiring ICU 52.1 which are skipped otherwise