symfony

This PR was merged into the 3.4 branch.

Discussion
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Ignore missing translation dependency in FrameworkBundle

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

This applies the fix from #31156 to the validator.xml file. The error came up a couple of times in the test suite for DoctrineBundle. When using `symfony/framework-bundle` with `symfony/validator` installed but without `symfony/translation`, the call to `setTranslator` will error out because of the missing `translator` service. Thus, the call to `setTranslator` needs to ignore a missing translator dependency to support this scenario.

I don't know how to best test this since the translation component is present in the `require-dev` directive of FrameworkBundle's `composer.json`. If you have any suggestions how to achieve this, please let me know.

Commits
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19eb90d8 Ignore missing translation dependency in FrameworkBundle